Political violence has destabilized democracies throughout history, from fascist Europe to today’s United States. While violence is not new in America, its current form is more personal and deadly. Research shows that white nationalism is the strongest predictor of public support for political violence, especially when people believe the government violates rights or constitutional norms. Those holding white nationalist views are far more likely to justify violence against political opponents or institutions. Even if most supporters never act, this tolerance normalizes violence, posing a serious threat to U.S. political stability.