There have been three mass shootings in the United States since July 28 involving angry, young white men. The July 28 shooting at a food festival in Gilroy, California, and the Aug. 4 shooting outside a nightclub in Dayton, Ohio, appear motivated by factors other than white supremacism. Even though most of the Dayton shooter's victims were African Americans, as of this writing, he does not appear to be a white supremacist based on his ideology and history. But when a man walked into a Walmart in El Paso, Texas, on Aug. 3 and opened fire with a semiautomatic rifle, killing at least 20 people and injuring dozens more before being captured by the police, he became the third high-profile white supremacist mass shooter of 2019.