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Extensive Definition

Gerrymandering is a form of redistricting in which electoral district or constituency boundaries are manipulated for electoral advantage. Gerrymandering may be used to help or hinder particular constituents, such as members of a racial, linguistic, religious or class group. It is used most often in favor of ruling incumbents or a specific political party. Societies whose government uses a single-winner voting systems are the most likely to have political parties that gerrymander for advantage. Most notably, gerrymandering is particularly effective in non-proportional systems that tend towards fewer parties, such as first past the post.
Some nations, such as the UK and Canada, authorize non-partisan organisations to set constituency boundaries to prevent gerrymandering. Gerrymandering is most common in countries where elected politicians are responsible for defining districts. They have obvious self interest in determining boundaries to their and their party's interest. The United States of America is an example of such a system.
Gerrymandering should not be confused with malapportionment, whereby the number of eligible voters per elected representative can vary widely. Nevertheless the ~mander suffix has been applied to particular malapportionments, such as the "Playmander" in South Australia and the "Bjelkemander" in Queensland. Sometimes political representatives use both gerrymandering and malapportionment to try to maintain power.


The word "gerrymander" is named for the Governor of Massachusetts Elbridge Gerry (July 17, 1744November 23, 1814), and is a blend of his name with the word "salamander," used to describe the shape of a tortuous electoral district pressed through the Massachusetts legislature in 1812. Jeffersonian democrats devised the boundaries —and Gerry reluctantly signed the district into law — to reduce competition by their electoral opponents in the upcoming senatorial election. "Gerrymander" is used both as a verb, meaning "to divide into political units to give special advantages to one group", as well as a noun to describe the resulting electoral geography. Although Elbridge Gerry's name was pronounced with an initial /g/ (a hard G), the "jerry" pronunciation has become most common. President Ronald Reagan always used the hard G and some older professors in the US still pronounce gerrymandering with the "hard g."

"Packing and cracking"

The two aims of gerrymandering are to maximize the effect of supporters’ votes and to minimize the effect of those of their opponents. To this end, one strategy, packing, is to concentrate as many voters of one type into a single electoral district to reduce their influence in other districts. A second strategy, cracking, involves spreading out voters of a particular type among many districts in order to reduce their representation by denying them a sufficiently large voting bloc to win any particular district. The strategies are typically combined, creating a few "forfeit" seats for packed voters of one type in order to secure even greater representation for voters of another type.

Effects of gerrymandering

Reduction in electoral competition and voter turnout

The most immediate and obvious effect of gerrymandering is that elections become less competitive in all districts, particularly packed ones. As electoral margins of victory become significantly greater and politicians have safe seats, the incentive for meaningful campaigning is reduced. In 2000, for example, only 57 of the 435 seats (13 percent) of the United States House of Representatives were competitive, that is, decided by margins of 10 percent or less.
As the chance of influencing electoral results by voting is reduced, voter turnout is likely to decrease. Correspondingly, political campaigns are less likely to expend resources to encourage turnout. With a reduction in competition, a candidate puts more effort into securing party nomination for a given district rather than gaining approval of the general electorate. In a gerrymandered district, the candidate is virtually assured of a win once nominated. In 2004, for example, when California's 3rd Congressional District became an open seat after Republican Congressman Doug Ose ran for higher office, the state's three strongest Republican congressional candidates campaigned vigorously against one another for nomination in the district's primary election. Several other districts were uncontested with no Republican nominees making even a token campaign effort.

Increased incumbent advantage and campaign costs


Less descriptive representation


Incumbent gerrymandering


Reforms to achieve competitive elections

Due to myriad issues associated with gerrymandering and the subsequent impact it has on competitive elections and democratic accountability, numerous countries have enacted reforms making the practice either more difficult or less effective. Countries such as the UK, Australia, Canada and most those in Europe have transferred responsibility of defining constituency boundaries to neutral or cross-party bodies.
In the United States, however, such reforms are controversial and frequently meet particularly strong opposition from groups that receive benefit from gerrymandering. In a more neutral system, they might lose considerable influence.

Redistricting by neutral or cross-party agency

The most commonly advocated electoral reform proposal targeted at gerrymandering is to change the redistricting process. Under these proposals, an independent, and presumably objective, commission is created and charged with redistricting, rather than having the legislature do it. This is essentially the system used in the United Kingdom, where the independent Boundary Commission determines the boundaries for constituencies for the House of Commons, Scottish Parliament, Northern Ireland Assembly, National Assembly for Wales, and the London Assembly, subject to ratification by the legislature in question (almost always granted without debate).
To help ensure neutrality, members of the board may be appointed from relatively apolitical sources such as retired state judges or longstanding members of the civil service, possibly with requirements for adequate representation among competing political parties. Additionally, members of the board can be denied access to information that might aid in gerrymandering, such as the demographic makeup or voting patterns of the population. As a further constraint, consensus requirements can be imposed to ensure that the resulting district map reflects a wider perception of fairness, such as a requirement for a supermajority approval of the commission for any district proposal. However, in the US in some states, such as Missouri following 2000 census, the requirement for consensus has led to deadlock. The equally numbered partisan appointees were unable to reach consensus in a reasonable timeframe, and the courts had to determine district lines.
In the US state of Iowa, the nonpartisan Legislative Services Bureau (LSB) (akin to the US Congressional Research Service) determines boundaries of electoral districts. Aside from satisfying federally mandated contiguity and population equality criteria, the LSB mandates unity of counties and cities. Consideration of political factors such as location of incumbents, previous boundary locations, and political party proportions are specifically forbidden. Since Iowa's counties are chiefly regularly shaped polygons, the LSB process has led to districts that follow county lines.

Shortest splitline algorithm

The Center for Range Voting has proposed a way to draw districts by a simple algorithm. Because the algorithm uses only the shape of the state, the number N of districts wanted, and the population distribution as inputs — and does not know the party loyalties of those people — the result cannot be biased. The algorithm (slightly simplified) is:
  1. Start with the boundary outline of the state.
  2. Let N=A+B where A and B are as nearly equal whole numbers as possible. (For example, 7=4+3.)
This district-drawing algorithm has the advantage of simplicity, ultra-low cost, clear unbiasedness, and it produces simple boundaries that do not meander needlessly. It has the disadvantage of ignoring geographic features such as rivers, cliffs, and highways. This landscape oversight causes it to produce districts differently than those an unbiased human would produce. These features can produce very complicated boundaries (such as Arizona's 2nd congressional district, which contains a fine filament winding for 200 miles along the river inside the Grand Canyon).
Also, splitline districts sometimes do not work well when one of the first few splitlines cuts through a large metropolitan area. This is most evident in the splitline allocation of Colorado
As of July 2007, shortest-splitline redistricting pictures are now available for all 50 states.

Changing the voting system

Because gerrymandering relies on the wasted vote effect to be effective, the use of a different voting system with fewer wasted votes can help reduce gerrymandering. In particular, the use of multimember districts alongside voting systems establishing proportional representation can greatly reduce the proportion of wasted votes, and therefore the potential for gerrymandering. Similarly, the use of semi-proportional voting systems such as cumulative voting or the single non-transferable vote can also help achieve a large reduction in the number of wasted votes, and due to their relative simplicity and similarity to first past the post they are often advocated as a replacement system by advocates of electoral reform.
Electoral systems with different forms of proportional representation are now found in nearly all European countries. In this way, they have multi party systems (with many parties represented in the parliaments) with higher voter attendance in the elections, fewer wasted votes, and more variety of political opinions represented.
Electoral systems with just election of one candidate in each district, and no proportional distribution of extra mandates to smaller parties tend to create two-party-systems (Duverger's Law). In these, just two parties compete in the national elections and thus the national political discussions are forced into a narrow two-party frame, where loyalty and forced statements inside the two parties trouble the political debate.

Changing the size of districts and the elected body

If a proportional or semi-proportional voting system alongside multimember districts is used, then increasing the number of winners in any given district will reduce the number of wasted votes. This can be accomplished both by merging separate districts together and by increasing the total size of the body to be elected. Since gerrymandering relies on exploiting the wasted vote effect to secure electoral advantage, reducing the number of wasted votes by increasing the number of winners in a district can greatly reduce the potential for gerrymandering. Unless all districts are merged, however, this method cannot eliminate gerrymandering entirely.
In contrast to proportional methods, if a nonproportional voting system with multiple winners (such as a form of bloc voting) is used, then increasing the size of the elected body while keeping the number of districts constant will not reduce the amount of wasted votes, leaving the potential for gerrymandering the same. Merging districts together under such a system, however, can reduce the potential for gerrymandering, but doing so also amplifies the effect of bloc voting's tendency to produce landslide victories, which has a similar effect in concentrating wasted votes among the opposition and denying them representation.

Using fixed districts

Another way to avoid gerrymandering is simply to stop redistricting altogether and use existing political boundaries such as state, county, or provincial lines. Any existing advantage may become deeply ingrained. The United States Senate, for instance, has more competitive elections than the House of Representatives due to the use of existing state borders rather than gerrymandered districts — Senators are elected by their entire state, while Representatives are elected by only a single district.
The use of fixed districts creates an additional problem, however, in that fixed districts do not take into account changes in population. Individual voters can come to have very different degrees of influence on the legislative process. This malapportionment can greatly affect representation after long periods of time or large population movements. In the United Kingdom during the industrial revolution, several constituencies which had been fixed since the formation of the British Parliament became so small that they could be won with only a handful of voters (rotten boroughs). Similarly, in the US the state legislature of Alabama refused to redistrict for more than 60 years, despite major changes in population patterns. By 1960 less than a quarter of the state's population (from rural areas) controlled the majority of seats in the legislature. By contrast, Switzerland and Spain have bicameral national legislatures like the United States, but both of its houses use fixed districts.

Objective rules to create districts

Another means to reduce gerrymandering is to create objective, precise criteria to which any district map must comply. Courts in the United States, for instance, have ruled that congressional districts must be contiguous in order to be constitutional. This, however, is not a particularly binding constraint, as very narrow strips of land with few or no voters in them may be used to connect separate regions for inclusion in one district. Another objective criterion is maximized compactness, subject to other constraints such as geographic features and boundaries of local governments.
One idea is to define within the constitution a specific minimum isoperimetric quotient , or minimum ratio, between the area and perimeter of any given congressional voting district. Computer algorithms could ensure that population districts were drawn in such a way so as to minimize Isoperimetric inequality and effectively eliminate gerrymandering. Although technologies presently exist to define districts in this manner, there are no rules in place mandating their use, and no national movement to implement such a policy. Such rules would prevent incorporation of jagged natural boundaries, such as rivers or mountains. When such boundaries are required (such as at the edge of a state), certain districts may not be able to meet the required minimums.
Another method is to define a minimum district to convex polygon ratio. To use this method, every proposed district is circumscribed by the smallest possible convex polygon (similar to the concept of a convex hull). Then, the area of the district is divided by the area of the polygon; or, if at the edge of the state, by the portion of the area of the polygon within state boundaries. The advantages of this method are that it allows a certain amount of human intervention to take place (thus solving the Colorado problem of splitline districting); it allows the borders of the district to follow existing jagged subdivisions, such as neighborhoods or voting districts (something isoperimetric would discourage); and it allows concave coastline districts, such as the Florida gulf coast area. It would mostly eliminate "bent" districts, but still permit long, straight ones. However, since human intervention is still allowed, the gerrymandering issues of packing and cracking would still occur, just to a lesser extent.

Use of databases and computer technology

The introduction of modern computers and the development of elaborate voter databases alongside special districting software has made gerrymandering a far more precise science. Using such databases, political parties can obtain detailed information about every household, including political party registration, previous campaign donations, and the number of times residents voted in previous elections. Using this data together with other predictors of voting behavior, such as age, income, race, or education level, creators of newly defined electoral districts can predict the voting behavior of each potential district with an astonishing degree of precision. They greatly increase the efficiency of gerrymandering and reduce the chance of accidentally making a district competitive.
See also: Geographic information system

National examples of gerrymandering



Early in Canadian history, both the federal and provincial levels used gerrymandering to try to maximize partisan power. Since responsibility for drawing electoral boundaries was handed over to independent agencies, this problem has essentially been eliminated. Manitoba was the first province to authorize a non-partisan group to define constituency boundaries in the 1950s. In 1964, the federal government delegated the drawing of boundaries for national seats to the "arm's length" Elections Canada. As a result, gerrymandering is not a major issue in Canada.
In 2006, a controversy arose on Prince Edward Island over the provincial government's decision to throw out an electoral map drawn by an independent commission. Instead they created two new maps. The government adopted the second of these, designed by the caucus of the governing party. Opposition parties and the media attacked Premier Binns for what they saw as gerrymandering of districts. Among other things, the government adopted a map that ensured that every current Member of the Legislative Assembly from the premier's party had a district to run in for re-election, whereas in the original map, several had been redistricted. Despite this, in the 2007 Provincial Election only 7 of 20 incumbent Members of the Legislative Assembly were re-elected (7 did not run for re-election).


After Chileans voted General Augusto Pinochet out of power in a 1988 plebiscite, the military government began working on a law to define the new electoral system for the 1989 elections. The 60 electoral districts for the Chamber of Deputies (lower house) were designed so that — if the results of the 1988 plebiscite were extrapolated to the coming parliamentary elections — in no district would the NO option duplicate the YES option. (The NO option was for removing Pinochet from power and to trigger democratic elections.) The rationale for this — in a system in which only two candidates are elected per district and where a coalition needed to duplicate the vote of the opponent to gain both district seats — was that the voters who favoured the NO option would vote for the Centre-Left coalition, which opposed the Pinochet dictatorship, and the ones that favoured the YES option would be inclined to vote for the candidates of the right, which supported the military government.
In the Senate —where a whole administrative region consists of one or two constituencies— gerrymandering of districts had a limited effect. Therefore, the government, to ensure that the winning majority (the Center-Left coalition, as it was expected) would be unable to reach the quorum necessary to change the Constitution by itself, allocated a number of seats to appointed senators. These unelected senators were eliminated in the 2005 constitutional reforms, but the electoral map remains untouched.


When the electoral districts in Germany were redrawn in 2000, the ruling Social Democratic Party (SPD) was accused of gerrymandering to marginalize the socialist PDS party. The SPD combined traditional PDS strongholds in eastern Berlin with new districts made up of more populous areas of western Berlin, where the PDS had very limited following.
After having won four seats in Berlin in the 1998 national election, the PDS was able to retain only two seats altogether in the 2002 elections. Under German electoral law, a political party has to win either more than five percent of the votes, or at least three seats, to "move into" or have an official place in the Bundestag. The PDS thus did not have a sufficient number of representatives elected to have an official position in the Bundestag, the German federal parliament. But the elected representatives held their seats as individuals. In the election of 2005, the PDS (renamed the "Left Party") gained 8.7% of the votes and thus earned an official place in the Bundestag.

Ireland, "Tullymandering"

In Ireland, in the mid-1970s, the Minister for Local Government, James Tully, attempted to arrange constituencies to ensure that the governing Fine Gael/Labour National Coalition would win a parliamentary majority. The Electoral (Amendment) Act 1974 was planned as a major reversal of previous gerrymandering by the Fianna Fáil party (then in opposition). Tully ensured that there were as many as possible three-seat constituencies where the governing parties were strong, in the expectation that the governing parties would each win a seat in many constituencies, relegating the Fianna Fáil party to one out of three. In areas where the governing parties were weak, four-seat constituencies were used so that the governing parties had a strong chance of still winning two. The election results created substantial change, as there was a larger than expected collapse in the vote, with Fianna Fáil winning a landslide victory, two out of three seats in many cases, relegating the National Coalition parties to fight for the last seat. Consequently, the term Tullymandering was used to describe the phenomenon of a failed attempt at gerrymandering.


In 1989 and 1990 elections, some accused the Popular Front of Latvia (PFL) of gerrymandering in favor of ethnic Latvians. For example, in 1990 the nearly pure Latvian-ethnic Ventspils district (with about 0.6% of population) was awarded 3 constituencies out of 201 (1.5%), with 2 of PFL candidates running unopposed.. In 1991, most native Russians were denied citizenship and therefore had no voting rights. Naturalization of native Russians began in 1995. In 1993 the country returned to proportional representation.

Northern Ireland

In the 1920s and 1930s, the Ulster Unionist Party created electoral boundaries for the Londonderry County Borough Council to ensure election of a Unionist council in a city where Nationalists had a marginal majority. Initially local parties drew the boundaries, but in the 1930s the province-wide government redrew them to reinforce the gerrymander. The Northern Ireland Civil Rights Association was formed in part in reaction to the injustice of the gerrymander.
In 1929 the Parliament of Northern Ireland passed a bill shifting the Parliament's electoral system from the relatively proportional single transferable vote (STV) to the less proportional first past the post or block voting system. The only exception was for the election of four Stormont MPs to represent the Queen's University of Belfast.
Regarding the change as abolition of electoral safeguards provided in the Government of Ireland Act of 1920, the British Government advised the Governor of Northern Ireland, the King's representative in Northern Ireland, to withhold Royal Assent from the legislation. After a major row, the British government backed down and advised the Governor to sign the Bill into law.
Many scholars believe that the boundaries were gerrymandered to underrepresent Nationalists. Some geographers and historians, for instance Professor John H. Whyte, disagree. ) They have argued that the electoral boundaries for the Parliament of Northern Ireland were not gerrymandered to a greater level than that produced by any single-winner election system, and that the actual number of Nationalist MPs barely changed under the revised system. Most observers have acknowledged that the change to a single-winner system was a key factor, however, in stifling the growth of smaller political parties, such as the Northern Ireland Labour Party and Independent Unionists.


The Elections Department was established as part of the executive branch under the Prime Minister of Singapore, rather than as an independent body. Critics have accused it of giving the ruling party the power to decide polling districts and polling sites through electoral engineering, based on poll results in previous election. Opposition parties have alleged that the Elections Department decisions have given unfair advantage to the ruling party and have affected the outcome of some electoral battles.
The most notable examples of such alleged gerrymandering are the dissolution of the Group Representation Constituencies (GRC) of Cheng San GRC and Eunos GRC. Each was dissolved by the Elections Department with population redistributed to other constituencies after opposition parties gained ground in elections. Such action was controversial. Critics have speculated about the possibility of the Elections Department's dissolving next the Aljunied GRC in the next General Elections, likely in 2010 or 2011. The opposition Workers' Party gained ground there in the General Elections in 2006, when it earned approximately 44% of the votes.
PAP strongholds, such as Tanjong Pagar GRC and Ang Mo Kio GRC, where Minister Mentor Lee Kuan Yew and Prime Minister Lee Hsien Loong respectively contest, have not been dissolved by the Elections Department. Since the introduction of the Group Representation Constituency (GRC) system, these areas have seldom been contested by the opposition. When contested, the PAP has won by a big margin of 65% of the votes.

United States

The United States has a long tradition of gerrymandering which precedes the 1789 election of the First U.S. Congress. In 1788, Patrick Henry and his Anti-Federalist allies were in control of the Virginia House of Delegates. They drew the boundaries of Virginia's 5th congressional district in an attempt to keep James Madison out of the U.S. House of Representatives.
Historically, each state legislature has used gerrymandering to try to control the political makeup of its United State House delegation. Partisan legislators typically try to maximize the number of congressional delegation seats under the control of the legislature's majority party.
Congress struggled over partisan issues as it formed and admitted new states from federally administered territories. Prior to the American Civil War, slavery was the basis of much controversy. The Senate was equally split between free- and slave-states. Because each side wanted to gain a majority, they nearly prevented the state of Maine from seceding from Massachusetts. The impasse ended when the Senate brokered the Missouri Compromise. Afterward Congress admitted new states only by the informal agreement of "one new free state for each new slave state" to maintain its delicate balance. Later, Congress decided to admit Texas and California as single, but large, states, slave and free, respectively.
The practice of gerrymandering the borders of new states continued past the Civil War and into the late 19th century. Congress split territories in the Rocky Mountains area into separate, relatively low-population states rather than fewer, larger ones to help the Republican Party maintain control of the Presidency . By the rules for representation in the Electoral College, each new state carried at least three electoral votes regardless of its population.
All redistricting in the United States has been contentious because it has been controlled by political parties vying for power. Under the constitution, districts for members of the House of Representatives are to be redrawn every ten years following each census. In many states, state legislatures have redrawn boundaries for state legislative districts at the same time.
When faced with losing power, however, members of some legislatures simply refused to redistrict. Early struggles for power were between rural and urban interests, as well as between political parties. The state legislature of Alabama, for instance, refused to redistrict from 1901 to the 1960s, despite changing conditions in a state that was industrializing and where population was rapidly moving to cities. Rural interests became prevalent in state politics, hampering the state's progress for most of the 20th century. In 1960, approximately a quarter of the state's population controlled the state legislature. When the state legislature could not agree on boundaries, a federal court worked with a new non-partisan body to conclude defining new districts in 1972.
This process can create strange bedfellows interested in securing reelection; in some states, Republicans have cut deals with opposing black Democratic state legislators to create majority-black districts. By packing black Democratic voters into a single district, they can essentially ensure the election of a black Congressman or reelection of a black state legislator. Due to the packed concentration of Democratic voters; however, the surrounding districts are more safely Republican in areas like the South, where white conservatives have increasingly shifted from the Democratic to the Republican Party in national elections in the last four decades.
In Pennsylvania, the Republican-dominated state legislature used gerrymandering to eliminate Democratic representative Frank Mascara. Mascara was elected to Congress in 1994. In 2002 the Republican Party altered the boundaries of his original district so much that he was pitted against fellow Democratic candidate John Murtha in the election. The shape of Mascara’s newly drawn district formed a finger that stopped at his street, encompassing his house though not the spot where he parked his car. Murtha won the election in the newly formed district.

Voting Rights Act of 1965

After Reconstruction and the granting of citizenship and suffrage to freedmen, state legislatures developed new constitutions with provisions to make voter registration and elections more complicated, such as poll taxes, residency requirements, literacy tests and grandfather clauses. These were designed to, and effectively succeeded in disfranchising most African Americans and many poor whites in southern states. In areas where African American and other minorities succeeded in registering, some states created districts that were gerrymandered to reduce the voting impact of minorities.
In a few circumstances, the use of goal-driven district boundaries may be used for positive social goals (at least considered so from less partisan viewpoints). When the state legislature considered representation for Arizona's Native American reservations, they thought each needed their own House member, because of historic conflicts between the Hopi and Navajo nations. Since the Hopi reservation is completely surrounded by the Navajo reservation, the legislature created an unusual district configuration which features a fine filament along a river course several hundred miles in length to attach two Navajo regions.
In another case (frequently cited as an outrageous example of gerrymandering), the California state legislature created a congressional district that extends over a narrow coastal strip for several hundred miles. It ensures that a common community of interest will be represented, rather than the coastal areas' being dominated by inland concerns. These are illustrative of factoring in communities of common interest in drawing district boundaries.

Recent steps

In a decision on June 28, 2006, the United States Supreme Court upheld most of a Texas congressional map engineered in 2003 by former House Majority Leader Tom DeLay. The 7-2 decision allows state legislatures to redraw and gerrymander districts as often as they like (not just after the decennial census. Thus they may work to protect their political parties' standing and number of seats, so long as they do not harm racial and ethnic minority groups. A 5-4 majority declared one Congressional district unconstitutional in the case because of harm to an ethnic minority.
Rather than allowing more political influence, some states' citizens are considering shifting redistricting authority from politicians and giving it to non-partisan commissions. For instance, Washington state created the standing Washington State Redistricting Commission and Arizona the Arizona Independent Redistricting Commission. The Rhode Island Reapportionment Commission and New Jersey Redistricting Commission are ad hoc but developed the past two decennial reapportionments tied to new census data.
According to its municipal charter, the city of San Diego uses a third party commission to define district boundaries.


United States

Inherent political right

Many politicians argue that because constituencies were to be made by politicians (such as the case in the United States and elsewhere), they have the right to manipulate it so that it gives them an advantage. The voters will still be represented, and an unpopular incumbent may still be unseated.

Better representation of minority groups

Gerrymandering can be used to create districts that better represent certain minorities. Such districts have been created to ensure representation for African American, Hispanic, and Asian American ethnic communities in the USA, particularly in California, Texas, and other states in the South.
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