Majority of immigrants coming from to the U.S. from the 1880s to 1924, typically of eastern & southern European origins. Having fewer cultural commonalities with native U.S. citizens, causing them to be segregated from U.S. society. Came from Italy, Greece, Croatia, Slovakia, Poland, & Russia; were poor and illiterate, Roman Catholic, Greek Orthodox, Russian Orthodox or Jewish. Due to prejudice & the need for laborers, they typically filled low paying, dangerous, unskilled industrial jobs in the cities. Settled in poor ethnic slums, having followed their relatives or neighbors. Around 25% planned to return home with money earned in America.