Demographic history of the United States
From Academic Kids
Between, 1880 and 1900 the urban population of the United States rose from 28% to 40% (1), and reached 50% by 1920, in part due to 9,000,000 European immigrants. After 1890 the US rural population began to plummet as farmers were displaced by mechanization and forced to migrate to urban factory jobs.
During the 1990s, Colorado's rural working-age population grew by 40% and the rural retiree population grew by 23%. The statewide population grew 31%, the statewide retiree population grew by 27%, and the statewide working-age population grew by 31%.
During the 1990s, the rural population of Kansas increased by 2%, while the statewide increase was 9%.
During the 1990s, Washington's rural population grew by 20%. Meanwhile, the rural working-age population grew 22% and the rural retiree population grew 16%. Overall, there was 21% growth with 23% for statewide working-age populations and 15% for retirees.