Today in history: On May 31, 1921, a two-day massacre erupted in Tulsa, Oklahoma, as white mobs began looting and burning the affluent Black district of Greenwood over reports a Black man had assaulted a white woman in an elevator; though the exact number remains unknown, as many as 300 Black Tulsans were killed during the riot. Also on this date: In 1790, President George Washington signed into law the first U.S. copyright act. In 1889, over 2,200 people in Johnstown, Pennsylvania, died when