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In page Emergency Quota Act:

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Based on the new formula, the number of new immigrants admitted fell from 805,228 in 1920 to 309,556 in 1921–22.[6] The average annual inflow of immigrants prior to 1921 was 175,983 from Northern and Western Europe and 685,531 from other countries, mainly Southern and Eastern Europe.[citation needed] In 1921, there was a drastic reduction in immigration levels from other countries, principally Southern and Eastern Europe.[citation needed]