What was the 1965 Immigration Act?

The Immigration and Nationality Act of 1965, also known as the Hart–Celler Act, is a federal law passed by the 89th United States Congress and signed into law by President Lyndon B. Johnson. The law abolished the National Origins Formula, which had been the basis of U.S. immigration policy since the 1920s. The act removed de facto discrimination against Southern and Eastern Europeans, Asians, as well as other non-Northwestern European ethnic groups from American immigration policy.

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missouri compromise of 1820 which prohibited slavery