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                                What were the government policies that curbed immigration?
                                1921 Emergency Quota Act: limited the number of immigrants who would be admitted from any country annually to 3% of the number of residents from that same country who lived in the United States, based on the United States Census figures from 1910.
1924 National Origins Act: the quota for immigrants entering the U.S. was set at two percent of the total of any given nation`s residents in the U.S. as reported in the 1890 census; after July 1, 1927, the 2% rule was to be replaced by an overall cap of 150,000 immigrants annually.