Dillingham Immigration Act
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The Immigration Restriction Act of 1921 limited the number of immigrants to the US to 3% of the population of their nationality already in the United States in 1910. This reduced the number of immigrants to America to less than a quarter of what it was before World War I.
[edit] Source
A Brief Timeline of U.S. Policy on Immigration and Naturalization <http://www.flowofhistory.org/themes/movement_settlement/uspolicytimeline.php>

