In 1930, the Quota Act of 1930 was intended to curtail the entry of Jews into South Africa.

In 1921 the United States Congress passed the Emergency Quota Act, which established national immigration quotas.

The 1921 Emergency Quota Act, and then the Immigration Act of 1924, restricted immigration according to national origins.

May 19 - The Emergency Quota Act is passed by the United States Congress, establishing national quotas on immigration.

It superseded the 1921 Emergency Quota Act.

The quarantine station was busiest in the early 1920s, after the adoption of the Emergency Quota Act, which restricted the number of immigrants who could enter the country.

In 1921, the Congress passed the Emergency Quota Act, followed by the Immigration Act of 1924.

Under the Emergency Quota Act passed in 1921, numerical limits on European immigration were imposed which created nationality quotas.

May 19 - The Emergency Quota Act passes the U.S. Congress, establishing national quotas on immigration.

Eventually, following World War I, these studies led to the Emergency Quota Act of 1921 and the Immigration Act of 1924.