(June–July 1846), short-lived independence rebellion precipitated by American settlers in California's Sacramento Valley against Mexican authorities. In 1846 approximately 500 Americans were living in California, compared with between 8,000 and 12,000 Mexicans. Nonetheless, early in June a group of about a dozen Americans seized a large herd of horses from a Mexican military commandant. On June 14 another group captured Sonoma, the chief settlement north of San Francisco. Led by William B. Ide, the Americans issued a declaration of independence and hoisted a flag, its white ground emblazoned with a grizzly bear facing a red star. On June 25 Capt. John Charles Frémont (Frémont, John C) arrived at Sonoma and gave his support to the Bear Flag Revolt. And on July 5 the insurrectionists elected Frémont to head the “Republic of California.”

But the Republic was quick to fall. On July 9 forces under Commodore John D. Sloat occupied San Francisco and Sonoma, claimed California for the United States, and replaced the bear flag with the American flag.