Question

Responding to xenophobic concerns, congress passed an emergency law restricting immigration in 1921. Among other provisions, the act established ________ ( a proportional share of a total) for nationalities on the basis of their numbers in the U.S. In 1910

Answer 1

Responding to xenophobic concerns, Congress passed an emergency law restricting immigration in 1921. Among other provisions, the Act established a quota (a proportional share of a total) for nationalities on the basis of their numbers in the U.S. in 1910.

The missing detail is: a quota.