national origin quotas Artikel lesen national origin quotas until 1952 Refugee Act of 1980 changes in immigration policy since 1965 Immigration pewresearch.org Pew Research Center Source until 1952 1790 Naturalization Act U.S. Immigration Laws and Rules - Pew Research Center 1790 Naturalization Act Refugee Act of 1980 pewresearch.org near historic highs national origin quotas SOURCE: Pew Research Center either banned or placed very strict limits Refugee Act of 1980 Refugee Act of 1980