1,250,000 per year. 
How Many People Can Immigrate to the United States per Year? According to the 1990 Immigration Act, the number of immigrants allowed into the United States every year is limited to 700,000. The act also allows for qualifying family members of legal immigrants to have easier immigration access. Number of immigrants coming to Canada --- an average of close to 250,000 per year since 1991. That's 684 per day and 28 per hour. This unnecessary and relentless intake is an abnormality in Canada's immigration history. It has overwhelmed many parts of Canada. U.S. immigration law is very complex, and there is much confusion as to how it works. The Immigration and Naturalization Act (INA), the body of law governing current immigration policy, provides for an annual worldwide limit of 675,000 permanent immigrants, with certain exceptions for close family members. According to the 2009 National Population Projection, produced by the US Census Bureau, the immigrant population in the US is increased approximately by 1,250,000 per year. The immigrants come mainly from Latin America (over 50%), followed by those from Asia (around 20%). According to the Immigration and Nationality Act if 1965, a total of 300,000 immigration visas are allowed each year. Family members and significant others of US citizens are not restricted. Legally, approximately 1 million per year. There are 700,000 slots open per year for legal immigration according to the 1990 immigration act.
http://www.jangattorney.com/faqs/how-many-people-can-immigrate-to-the-united-states-per-year/ http://www.immigrationwatchcanada.org/ http://www.immigrationpolicy.org/just-facts/how-united-states-immigration-system-works-fact-sheet http://www.numberof.net/number-of-immigrants-to-us-per-year/ http://www.answers.com/Q/How_many_immigrants_are_allowed_into_the_us_every_year http://www.answers.com/Q/How_many_immigrants_are_allowed_into_the_us_every_year
how many immigrants are allowed in the us each year