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The United States plays and important role in the study of international migration because we get a lot of immigrants.
- about 80 million people migrated to the US between 1820 and 2015 including 42 million who were alive in 2015
-three main eras of immigration were colonial settlement in the seventeenth and eighteenth centuries, mass European immigration in the late nineteenth and early twentieth centuries, Asia and Latin American immigration in the late twentieth and early twenty- first centuries
- most of the Africans were forced to migrate to the United States as slaves, whereas most Europeans were voluntary migrants.
-between 1820 and 1920, approximately 32 million people immigrated to the United States.