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.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be that the Articles of Confederation allowed the central government to declare war and sign treaties, since this was practically all the government could do under the Articles. </span></span>
They were mostly from china, building the railroad was the easiest way for them to settle in America and make a living.
