The document summarizes the Red Summer of 1919, when over 20 race riots broke out across many American cities. It describes the major causes of the riots as racial tensions arising from the Great Migration, which drastically increased the African American populations in northern cities. As African Americans competed with whites for jobs and housing, resentment grew. The worst violence occurred in Chicago, where a riot began after African Americans were barred from a whites-only beach and a teenage boy drowned after being attacked near the beach. Over several days, 38 people were killed and hundreds injured in clashes between white and black neighborhoods in Chicago.