The climate was very cold up there and the terrain tended to be rocky
Answer:
The North European Plain
Explanation:
The North European plain is the most populated region of the four mentioned in the question.
This was not always the case, and until the Middle Ages, the North European Plain was sparsely populated. However, ever since, its population has been growing, because despite having a climate that is wet and cool the majority of the year, the soil is very fertile, and the lack of physical geographical barriers makes it easier for human dwelling.
Responding to xenophobic concerns, congress passed an emergency law restricting immigration in 1921. Among other provisions, the act established .a quota for nationalities on the basis of their numbers in the US in 1910,
The quota that enacted limit a specific race from entering the united states within that period
hope this helps
