"Changing U.S. Immigration"

- Then United States plays a special role in then study of international migration

- The United States has had three main eras of immigration

- Most Africans were forced to migrate to the United States as slaves

- Between 1820 and 1920, approximately 32 million people immigrated to the United States

- 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 WW2. Number steadily increased beginning in the 1950s then surged to really high levels during the 21st century

- Reason fro immigration remains the same: rapid population growth has limited prospects for economic advancement at home