By Eric Jacobson
Yavapai County Sheriff William J. Mulvenon (b. 1851 - d. 1915) played a crucial role in the Pleasant Valley War that resulted in the highest number of deaths of all range wars in the American West. It is estimated that between 1882-1892, 35 to 50 persons died as two feuding families, the Tewksburys and Grahams, fought over land, sheep and cattle. Few combatants were arrested, but Yavapai Sheriff Billy Mulvenon attempted to follow Arizona Territorial Governor Conrad Zulick’s instructions in 1887 to finally end the conflict. One of the consequences of the decade-long violence was the conclusion reached by federal authorities that the Arizona Territory was not ready for statehood.
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