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- Colorado : State in the western United States.
- U.S. immigration policy : Add brief definition or description
- Federation for American Immigration Reform : A U.S. group that wants legal immigration to be minimized and strong enforcement to prevent illegal immigration
- Sierra Club : Add brief definition or description
- John Tanton : Retired ophthalmologist; active in natural conservation, which led him to consider population issues; Original founder and board of directors member of Federation for American Immigration Reform; national President of Zero Population Growth from 1975 to 1977 and was Chairman of its Immigration Study Committee (1973-1975); Chairman of the Sierra Club National Population Committee (1971-1975). Past and current publisher of The Social Contract; accused by the Southern Poverty Law Center of being at the heart of white nationalist movements
- U.S. Democratic Party : One of the two major political parties in the United States; usually described as center-left.
- U.S. Republican Party : One of two major contemporary political parties in the United States; center-right; the elephant is its symbol.