How have immigration patterns changed the U. S. in the 1900s i need this asap

The immigration flow shifted.

Explanation:

By the early 1900s, the nation’s predominant immigration flow shifted away from northern and western European nations and toward southern and eastern Europe. In response, laws were passed in 1921 and 1924 to try to restore earlier immigration patterns by capping total annual immigration and imposing numerical quotas based on immigrant nationality that favored northern and western European countries. These were called quotas and only a certain number of people could come into the country under these working for the state.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.