 Since the early 1990s, Mexican immigrants are no longer concentrated in California, the Southwest, and Illinois, but have been coming to new gateway states, including New York, North Carolina, Georgia, Nevada, and Washington, D.C., in increasing numbers.This phenomenon can be mainly attributed to poverty in Mexico, the growing demand for unskilled labor in the U.S., the existence of established family and community networks that allow migrants to arrive in the U.S. with people known to them.The framework of U.S. immigration law has largely remained the same since 1965.