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.
Answer:
Communist States
Explanation:
The countries shaded in all had communist governments.
<span>an increase in trade with the west. their economy became ore westernized.</span>
