The United States accepts more immigrants than all other nations of the world combined.
Officially about 1 million legal immigrants come to the United States each year. These are
people who are granted permanent residence or "green cards." Unofficially, perhaps as many
as 4 million legal and illegal immigrants cross the nation's borders each year. Some cross the
Mexican or Canadian borders surreptitiously or with false documentation. Others simply
overstay their tourist or student visas. immigration and Customs Enforcement (ICE)
acknowledges about 33 million admissions to the United States each year. Most of these
admissions are for tourists, business people, and students. The government does not track visitors,nor does it systematically proceed against individuals who overstay their visas. Estimates of the number of illegal immigrants living in the United States range up to 15 million.