Minneapolis has a bloody, unacknowledged heritage. On the shore of Lake Harriet, Ojibwe warriors killed a Dakota man, triggering two retaliatory massacres. Ten years later, pioneer settlers roved the land of Minneapolis in gangs for protection from other pioneer gangs. When a lynch mob hanged a violent criminal across the street from Central High School, they left his corpse dangling for hours. Rioting Riversiders toppled a streetcar and attacked...