Of course the events in Las Vegas are a terrible tragedy for our nation and any steps we can take to prevent a similar event from ever happening again are welcome. It is however, usually acknowledged that the worst mass murder in American history involving people not at war and innocently going about their business took place in December, 1890 with the Massacre at Wounded Knee in S. Dakota. It's estimated that between 250-300 men, women, and children were killed.