Conquest of California

Conquest of California
	Part of the Mexican–American War
	Top: Battle of Río San Gabriel; Bottom: Battle of San Pasqual
Date	15 June 1846 – 13 January 1847; (6 months, 4 weeks and 2 days);
Location	Northern Theatre:; San Francisco North Bay Area, Monterey Bay, Santa Clara Valley, Salinas Valley; Southern Theatre:; San Diego Bay, Los Angeles Basin, Pomona Valley, Santa Barbara, San Pasqual Valley
Result	American victory; Treaty of Cahuenga Full results American Military Government Installed in Alta California; Californio Loss of Power and Influence in California; Beginning of the California genocide; Major American Migration to the West; Displacement of Mexican Calfornios & Native Americans; Constitution of California, 1849; Eventual Californian statehood; ;
Territorial; changes	Mexican Cession (1848)
Belligerents
United States; California Republic;	Mexico
Commanders and leaders
John C. Frémont; Robert F. Stockton; Stephen W. Kearny; William B. Ide; Ezekiel Merritt; Henry L. Ford; John D. Sloat; John B. Montgomery; Archibald Gillespie ; Benjamin Wilson ; William Mervine ; Charles Burroughs; James F. Reed	José Castro; José María Flores; Andrés Pico ; Mariano Vallejo ; Pío Pico; Joaquín de la Torre; Mariano Silva; José de Jesús Noé; Serbulo Varela; José del C. Lugo; José Antonio Carrillo; Manuel Castro; Francisco Sánchez
Units involved
Units California Republic ; Bear Flag Rebels ; United States ; California Battalion ; Army of the West Naval units; Pacific Squadron Occupation units; Mormon Battalion; 7th Regiment of New York Volunteers ;	Units Mexico ; Castro Battalion ; P. Pico Battalion ; Flores Battalion ; Local Town Militias Cavalry units; A. Pico Lanceros; Lugo Lanceros; Carrillo Lanceros ;
Strength
USA; Initial strength: 30-300 militia; Horses and Mules; Native American Scouts; Peak strength: 2,000+ personnel (1847);	Mexico; Initial strength: 260-500 militiamen; 1 swivel Canon; ; Horses and Mules; Peak strength: 500 personnel (Jan. 1847);
Casualties and losses
California Republic: 1-2 killed; 3-7 wounded; 2 captured or missing; ; United States: ~35-40 killed; ~53-64 wounded; 25 captured or missing; ;	Mexico: ~11-14 killed; ~40-60 wounded; 2-3 captured or missing; ;

The Conquest of California, also known as the Conquest of Alta California or the California Campaign, was an important military campaign of the Mexican–American War carried out by the United States in Alta California (modern-day California), then a part of Mexico. The conquest lasted from 1846 into 1847, until military leaders from both the Californios and Americans signed the Treaty of Cahuenga, which ended the conflict in California.

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