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Sixteen-year-old Ella Stewart sent the first telegraphed message from Arizona Territory.

Historical image related to Sixteen-year-old Ella Stewart sent the first telegraphed message from Arizona Territory. from December 15, 1871

Ella Stewart Udall

American Latter-day Saint telegraphist and entrepreneur (1855–1937)

Eliza Luella "Ella" Stewart Udall was an American telegraphist and entrepreneur. Recruited by Brigham Young in 1870 and stationed at the Deseret Telegraph Company office in Pipe Spring in 1871, Udall was the first telegraph operator in Arizona Territory.
Source: Wikipedia (CC BY-SA)

Arizona Territory

Territory of the US (1863–1912)

The Territory of Arizona, commonly known as the Arizona Territory, was a territory of the United States that existed from February 24, 1863, until February 14, 1912, when the remaining extent of the territory was admitted to the Union as the state of Arizona. It was created from…
Source: Wikipedia (CC BY-SA)