By Al Bates
In January 1737 Captain Juan Bautista de Anza reported from his outpost in Sonora to his superiors in central Mexico that there were vast deposits of silver near the “Arizona rancheria” owned by his deputy mayor, Bernardo de Urrea. That discovery, known as the Planchas de Plata, had two results. The first was a struggle over ownership of the silver. The second was the adoption of the rancheria’s name to identify the surrounding area as well.
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