Question

What act set up a formula to determine the number of immigrants to allow into the US

Answer 1

National Origins Act

Answer 2

The National Origins Act of 1924 was a component of the Immigration Act of 1924 that established a quota system for determining how many immigrants could enter the United States, restricted by country of origin. Although the quota system established by this Act has been abolished and other provisions heavily modified by the Immigration Act of 1965, this Act represents a significant redesign of the American immigration system for several decades in the mid-20th century. The impetus to restrict immigration picked up steam in 1907 when the Dillingham Commission recommended restricting immigration from Southern and Eastern Europe, noting that immigration from those countries was “undesirable.”