There is no shortage of great American rivalries. Myths are born in the hair-trigger atmosphere of a feud, such that over time it’s gets harder and harder to ferret out what the real facts were and how the disagreements even started. Bil gets his hands dirty to figure out what got the Hatfield’s and the McCoy’s so worked up, if Hamilton really wasted his shot at Burr, and what actually happened at the O.K. Corral.