1) Between 1870 and 1924, 26 million immigrants came to the United States, with 1 in 4 Americans by 1920 having been born abroad. Many immigrants arrived through Ellis Island in New York or Angel Island in San Francisco to escape problems in their home countries and seek opportunity. 2) Immigrants faced challenges after arrival, such as finding housing and work in unfamiliar urban environments and facing prejudice from native-born Americans who believed immigrants lowered wages and were morally corrupt. 3) However, immigrants also found opportunities in America including jobs, education for their children, rights to vote, and chances to start businesses. Overall immigration was a major factor in America's growing urbanization and becoming a more diverse society.