John C. Fremont Takes Over The Republic
On June 15, 1846, some thirty settlers, mostly American citizens, staged a revolt and seized the small Mexican garrison in Sonoma.
They raised the "Bear Flag" of the California Republic over Sonoma. The republic was in existence scarcely more than a week before the U.S. Army, led by Frémont, took over on June 23. The California state flag today is based on this original Bear Flag and still contains the words, "California Republic."
John Charles Frémont (January 21, 1813 – July 13, 1890), was an American military officer, explorer, the first candidate of the Republican Party for the office of President of the United States, and the first presidential candidate of a major party to run on a platform in opposition to slavery. During the 1840s, that era's penny press accorded Frémont the sobriquet The Pathfinder, which remains in use, sometimes as "The Great Pathfinder".
Wikipedia: John C. Fremont
Wikipedia: Mexican-American War