1924. U.S. President Calvin Coolidge signs the Johnson-Reed Act, which included the National Origins Act and the Asian Exclusion Act, into federal law. It severely curtailed immigration from East Asian, Eastern European and Southern European countries by imposing a system of quotas that limiting the total number of immigrants to 2 per cent of the number of people originating in a given country who were living in the U.S. in 1890.
Once enacted, the law permitted the United States to favour immigrants from Northern European countries, in line with the philosophy of eugenicist Madison Grant in his influential 1916 book The Passing of the Great Race.
-Amy Dyrbye
Immigration Act of 1924. (2014). Wikipedia. Retrieved from http://en.wikipedia.org/wiki/Immigration_Act_of_1924.