National Origins Act: This act passed in 1924 established quota systems that limited immigration from certain countries based on their national origins.
McCarran-Walter Act: Enacted in 1952, this law expanded upon previous immigration restrictions by focusing specifically on excluding individuals who were considered subversive or communist sympathizers.
Immigration and Nationality Act of 1965: This act abolished national origins quotas and introduced new provisions for family reunification and skilled workers, leading to significant changes in U.S. immigration policy.