"In the mid-twentieth century, relative black wage growth in the North lagged behind the Jim Crow South. Inter-regional migration may explain this trend. Four million black southerners moved North from 1940 to 1970, more than doubling the northern black population. Black migrants will exert more...

During the Great Depression, as in the modern era, in-migrants were accused of taking jobs and crowding relief rolls. Unlike today, the targets of protest during the Depression were typically American citizens from other parts of the country, rather than the foreign born. Using aggregate data on...