A few recommended additions:
Amy Kate Bailey and Stewart E. Tolnay. Lynched: The Victims of Southern Mob Violence. Chapel Hill: University of North Carolina Press, 2015
Brent M. S. Campney. This Is Not Dixie: Racist Violence in Kansas, 1861–1927. Urbana: University of Illinois Press, 2015
Ann V. Collins. All Hell Broke Loose: American Race Riots from the Progressive Era through World War II. Santa Barbara, CA: Praeger, 2012.