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President Biden on Tuesday commemorated the 100th anniversary of the Tulsa race massacre, the ravaging of a once-prosperous Black business district and neighborhood by a White mob. “As painful as it is, only in remembrance do wounds heal. We just have to choose to remember, memorialize what happened here in Tulsa, so it can’t be erased,” the president said of the massacre, which stands as one of the worst episodes of racial violence in U.S. history.Step-by-step explanation: