Which 1920s event is most directly linked to the cultural backlash over immigration in the US during that time?

The great migration

Explanation:

The great migration is the movement of African American in the early 1900 to late 1900 from rural communities in the south to big cities in the West and North. During this time, it is projected that over 5 million blacks southerner's moves to urban cities in the North and West. This process was strained as a result of growing social as well as economic inequalities, which increasingly generates labor shortages and sufficient resources for all.