Working on the ridiculousness of Hollywood and how you get from this guy:
The Deadliest Foe
As dangerous as the Wild West was, all the battles and armed conflicts paled when compared to the deadly foe of smallpox. An airborne scourge for centuries, smallpox arrived in the New World with the Spanish in 1509 and spread from the Caribbean to the North American Native American population where it decimated entire tribes. In the Lincoln County War, both John Tunstall and Cattle King John Chisum came down with the disease (both survived). Although vaccination campaigns began in the early 1800s, the disease was not eradicated until the 1970s.