 Like much of the rest of the American Midwest, Indiana's exports and job providers remained largely agricultural until after World War I. Indiana's developing industry, backed by inexpensive natural gas from the large Trenton Gas Field, an educated population, low taxes, easy access to transportation, and business-friendly government, led Indiana to grow into one of the leading manufacturing states by the mid-1920s.The state's central location gave it an dense network of railroads.The line most identified with the state was the Monon Line.