Republican Oklahoma State Superintendent Ryan Walters says the Tulsa massacre in Greenwood can be taught in schools but the instruction should not mention the issue of race. "Let's not tie it to skin color" For two days in 1921 — black residents were terrorized and had their homes and businesses destroyed by white lynch mobs. The event is considered one of the worst incidents of racial violence in American history rawstory.com/oklahoma-superi…