1861: The Overland Mail Company discontinues its route through Arizona because the Civil War in the east forced troop withdrawals and the closing of forts, leaving no protection for the letter carriers against Apache Indians.
1881: Arizona Telephone Company begins telephone service in Tucson with one operator and about 20 subscribers. (from "The book of Tucson firsts" by Larry Cox)
1919: A troop train carrying discharged soldiers from Nogales to Tucson is rerouted after military authorities learn that professional gamblers had gathered in Tucson, hoping to relieve the soldiers of their back-pay.
1931: The Canyon de Chelly National Monument is established.
1952: Construction of the Arizona-Sonora Desert Museum begins.
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