Quotas on immigrants from particular countries were established:

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Quotas on immigrants from particular countries were established in the Immigration Act of 1924, also known as the National Origins Act. The act set quotas based on 2% of the total population of each nationality in the US as of the 1890 census. This drastically limited immigration from Eastern and Southern Europe, as well as Asia, and favored immigration from Northern and Western Europe.

Quotas on Immigrants from Particular Countries Were Established