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• About 80 million people migrated to the United States between 1820 and 2015, including 42 million who were alive in 2015
• three main eras of immigration:

1. colonial settlement in the seventeenth and eighteenth centuries
2. mass European immigration in the late nineteenth and early twentieth centuries
3. asian and latin American immigration in the late twentieth and early twenty-first centuries

• In 1790 the U.S. population was 3.9 million, including 950,000 who had immigrated
• There are two main principal places, Europe and Sub-Saharan Africa
• 62% of immigrants came from Europe
• 38% of immigrants had been shipped as slaves from Africa to the colonies
• Most Africans were forced to migrate to the U.S. as slaves while most europeans were voluntary migrants.
• between 1820 and 1920, approximately 32 million people immigrated to the United States, nearly 90% of them emigrated from Europe
• Emigration from Ireland and Germany resumed following a temporary decline during the U.S. Civil War
• Southern and Eastern Europe: Annual immigration to the United States reached 1 million
• Among European countries, Germany has sent the largest number of immigrants to the United States
• Immigration to the United States dropped sharply in the 1930s and 1940s, during the Great Depression and World War 2
• More than three-fourths of the recent U.S. immigrants have emigrated from two regions: Latin America and Asia
• Around 13 million Latin Americans have migrated to the U.S.
• around 7 million Asians have migrated to the U.S.
• Mexico passed Germany in 2006 as the one who has sent the U.S. the most immigrants