Answer :
Canada and Mexico were the two countries that were not subject to immigration quota limitations under the johnson-reed act of 1924.
Immigration Act of 1924:
the Immigration Act of 1924, also known as the Johnson-Reed Act and including the Asian Exclusion Act and the National Origins Act (Pub.L. 68-139, 43 Stat. 153, enacted May 26, 1924), was a United States federal law that prohibited Asian immigration and established quotas for Eastern Hemisphere immigrants. The legislation also allowed the founding of the United States Border Patrol.
The 1924 legislation superseded prior statutes by virtually prohibiting all emigration from Asia and establishing a total immigration limit of 165,000 for nations outside the Western Hemisphere, representing an 80% fall from the average before World War I. As a temporary measure, quota limitations per nation were decreased from those established by the Emergency Quota Act of 1921 (3% of a country's foreign-born population present in the United States in the 1910 census) to 2% of the foreign-born population reported in the 1890 census. In 1927, a new quota system was implemented, based on each nationality's percentage of the overall U.S. population in the 1920 census, which would rule American immigration policy from 1929 through 1965.
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