(Los Angeles Times 2015)
What is Immigration?
Immigration is the influx of people to a country or region which is different from their country of birth. In the United States, immigration has been a basic part of life at least since the settlement of Jamestown in 1607 and remains part of American life today. One of the truisms of U.S. history, then, would seem to be that all Americans are immigrants or the descendants of immigrants.
Graph: Where Illegal Immigrants Come From
Image from The Immigration Debate
(WORLDATLAS.COM)