Statement of Significance (as of designation - December 19, 1960):
Established June 1835 to check possible Russian expansion from Fort Ross and to control the Indians, Sonoma Pueblo was the chief military base of the Mexican Government in Alta California; Mission San Francisco Solano de Sonoma, founded 1823, is the last of the 21 California missions. On June 14, 1846, the raising of the Bear Flag in the Plaza marked the beginning of the American revolt against Mexican rule.
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