California Republic
The California Republic, also called the Bear Flag Republic, is the name used for a period of revolt against Mexico initially proclaimed by a handful of American settlers in Mexican California
Alta California
Alta California was a province and territory in the Viceroyalty of New Spain and later a territory and department in independent Mexico. The territory was created in 1769 out of the northern part of the former province of Las Californias, and consisted of the modern American states of California,...

 on June 14, 1846, in Sonoma
Sonoma, California
Sonoma is a historically significant city in Sonoma Valley, Sonoma County, California, USA, surrounding its historic town plaza, a remnant of the town's Mexican colonial past. It was the capital of the short-lived California Republic...

. This was shortly before news of the Mexican–American War
Mexican–American War
The Mexican–American War, also known as the First American Intervention, the Mexican War, or the U.S.–Mexican War, was an armed conflict between the United States and Mexico from 1846 to 1848 in the wake of the 1845 U.S...

 had reached the area. The participants declared independence from Mexico, but they did not form a functional provisional government. Thus, the "republic" never exercised any real authority, and it was never recognized by any nation.