Southern and Eastern Europe were the primary sources of new immigrants to America at the turn of the 20th century. These immigrants faced both push factors like poverty, unemployment and famine in their home countries, as well as pull factors like employment opportunities and the idea of America as a land of opportunity. They faced difficult journeys and conditions upon arrival, with many settling in ethnic neighborhoods in cities. However, nativist groups opposed the new immigrants and Congress passed laws in the 1920s limiting immigration. The large influx of immigrants contributed to rapid urbanization and industrialization in the United States.