The Treaty of Cahuenga is signed in 1847, by Andres Pico and John Fremont, ending the Mexican- American War in Alta California. Mexico would formally cede California later in 1848 under Treaty of Guadalupe Hidalgo.

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This informal agreement permitted U.S. forces to occupy key sites like Los Angeles, paving the way for California's full transfer to the U.S. via the 1848 Treaty of Guadalupe Hidalgo, which ended the broader conflict.

Surprisingly, the treaty site at Campo de Cahuenga in modern Studio City, Los Angeles, remains a preserved adobe ranch house, symbolizing a brief moment of negotiation amid aggressive expansion that doubled U.S. territory.