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When did the US restrict immigration?

In the 1920s, restrictions on immigration increased. The Immigration Act of 1924 was the most severe: it limited the overall number of immigrants and established quotas based on nationality. Among other things, the act sharply reduced immigrants from Eastern Europe and Africa.

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does that help?

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The Immigration Act of 1924 limited the number of immigrants allowed entry into the United States through a national origins quota. The quota provided immigration visas to two percent of the total number of people of each nationality in the United States as of the 1890 national census.

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