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Federation policy oversees and regulates immigration to the United States and citizenship of the United States.The United States Congress has authority over immigration policy in the United States, and it delegates enforcement to the Department of Homeland Security.
Mexico, [a] [b] officially the United Mexican States, [c] is a country in North America.It borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundaries with the Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east.