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United States control of the area began in 1846 during the Mexican-American War when Commodore John D. Sloat, commander of the U.S. Navy's Pacific Squadron, landed unopposed a small force in Monterey and claimed the territory and the Presidio for the United States.
Commodore John D. Sloat claimed California for the United States on July 7, 1846, and Commander John B. Montgomery of USS Portsmouth arrived at the coastal village of Yerba Buena on July 9, 1846 to take control of the area for the United States.