<P> The Immigration Act of 1924, also called the National Origins Act, provided that for three years the formula would change from 3% to 2% and the basis for the calculation would be the census of 1890 instead of that of 1910 . After June 30, 1927, total immigration from all countries will be limited to 150,000, with allocations by country based upon national origins of inhabitants according to the census of 1920 . The quota system applied only to non-Asian immigrants . It aimed to reduce the overall number of unskilled immigrants, to allow families to re-unite, and to prevent immigration from changing the ethnic distribution of the population . The 1924 Act also included the Asian Exclusion Act, which limited immigration to persons eligible for naturalization . As a result, East Asians and South Asians were effectively banned from immigrating . Africans were also subjected to severe restrictions . Immigration from North and South America was not restricted . </P> <P> The Immigration and Nationality Act of 1952 retained the National Origins Formula . It modified the ratios to be based on the 1920 census and eliminated racial restrictions, but retained restrictions by national origin . President Harry Truman vetoed it because of its continued use of national quotas, but the Act was passed over his veto . The quotas were in addition to 600,000 refugees admitted from Europe after World War II . </P> <P> The National Origins Formula was abolished by the Immigration and Nationality Act of 1965, which marked a significant change in American immigration policy . It replaced the system with two quotas for the Western and Eastern hemispheres . </P>

The national orgins act did not apply to immigrants from which country