Feud situation - little wars in which families or factions took turns killing one another - were not uncommon in early America. In the American West, the post Civil War era was particularly productive of these violent episodes and every state west of the Mississippi experienced one or more of them. Texas was the leader with as many as a hundred feuds and the region between San Antonio and Houston was once known as the Pure Feud Belt. Only one major feud broke out in territorial Arizona - the so called Pleasant Valley War. But it was big and bloody enough to command national attention. And it helped persuade the rest of the country that Arizona was too wild and uncivilized to be admitted as a State. Don Dedera presents a wonderful and comprehensive history of this affair, placing the events and players in their true historical context.
The best researched-book written on the infamous Pleasant Valley Feud, which became the basis for Zane Grey's novel "To the Last Man" Highly recommended.