Immigration patterns in the US have fluctuated over time due to changing government policies. Settlement has been uneven, concentrated in certain regions and cities, and the source of immigrants has shifted from Europeans to Latin Americans. Immigration policies have restricted some groups, like the Chinese Exclusion Act of 1882, while family reunification and protecting US labor are goals of the 1965 Immigration and Naturalization Act. Illegal immigration and its economic and social impacts remain controversial issues today.