 Existing social tensions and housing shortages were exacerbated by the arrival of nearly 400,000 migrants, both African-American and White Southerners, from the Southeastern United States between 1941 and 1943.The new migrants competed for space and jobs, as well as against European immigrants and their descendants.The Detroit rebellion was one of three that summer; it followed ones in Beaumont, Texas, Harlem, New York, racial riots in Los Angeles, California, and Mobile, Alabama.