Emergency Quota Act of 1921
The Immigration Act of 1921, sometimes called the Emergency Quota Act, was a highly restrictive law that evolved from suggestions made by the U.S. Immigration Commission in 1911.
It set, for the first time, some numerical limits on immigration by establishing an annual quota for persons from each country outside the Western Hemisphere at three percent of the number of foreign-born persons from that country who were counted in the 1910 census.
The maximum number of quota immigrants under this law was 387,803 in any one year. No quotas were given for Asian countries, and persons born in the Western Hemisphere or who had lived in a country of the Western Hemisphere for at least one year could come in freely if they were otherwise eligible. The act was supposed to expire after one year, but was extended until 1924.