What other factors besides overcrowding might have contributed to the race riots of 1919? consider the impact of world war i ending and thousands of american soldiers returning home from europe

The fact that many people came to the US from Europe and the various countries of Africa, as well as the Middle east and Asia. This happened because Europe was destroyed more or less at the time and it didn't present many opportunities for people. Therefore, they moved to the US. And all of this mixing of different ethnicities of people who have seen war and its attrocities lead to a lot of tensions. 

Cis the