The Treaty of Cahuenga was an 1847 agreement signed during the Mexican–American War that ended the Conquest of California and resulted in a ceasefire between Californios and American forces. The treaty emerged from the broader conflict between the United States and Mexico, which extended into Alta California (modern-day California) and necessitated a resolution to the fighting in the region.
The treaty was drafted in both English and Spanish by José Antonio Carrillo and signed on 13 January 1847 at the Campo de Cahuenga. John C. Frémont signed on behalf of American forces, while Andrés Pico represented the Mexican forces. The agreement established the formal terms for ending hostilities in California, addressing the surrender of military assets and the status of combatants and civilians affected by the conflict.
The treaty's outcome fundamentally altered the status of California and its inhabitants. The Californios were required to surrender their artillery and all prisoners from both sides were to be immediately freed. Those Californios who agreed not to take up arms again during the war and to obey United States laws and regulations were permitted to return peaceably to their homes and ranchos. They were granted the same rights and privileges as United States citizens and were not compelled to take an oath of allegiance until a treaty of peace was formally signed between the United States and Mexico. Additionally, they were given the privilege of leaving if they chose to do so. This agreement effectively ended the military campaign in California and established the framework for the transition of California from Mexican to American control.
The Mexican-American War (1846–1848) grew from the annexation of Texas (1845) and a disputed border between Texas and Mexico at the Rio Grande. President James K. Polk ordered US troops under General Zachary Taylor into the contested zone; after a skirmish that killed American soldiers, Congress declared war in May 1846. US forces won a series of engagements — Palo Alto, Monterrey, Buena Vista — before General Winfield Scott led an amphibious landing at Veracruz and an overland campaign to Mexico City, which fell in September 1847. The Treaty of Guadalupe Hidalgo (February 1848) transferred California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming to the United States in exchange for $15 million and assumption of $3.25 million in claims — roughly 525,000 square miles, a 67 percent expansion of US territory. The war's outcome immediately reopened the slavery question: the Wilmot Proviso, debated throughout the war, proposed banning slavery from any territory acquired from Mexico, foreshadowing the sectional crisis of the 1850s.
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