While racially motivated riot violence certainly existed in the United States both before and after the Progressive Era through World War II, a thorough account of race riots during this particular time span has never been published. All Hell Broke Loose fills a long-neglected gap in the literature by addressing a dark and embarrassing time in our country's history—one that warrants continued study in light of how race relations continue to play an enormous role in the social fabric of our nation.Author Ann V. Collins identifies and evaluates the existing conditions and contributing factors that sparked the race riots during the period spanning the Progressive Era to World War II throughout America. Through the lens of specific riots, Collins provides an overarching analysis of how cultural factors and economic change intersected with political influences to shape human actions—on both individual and group levels.