The Peraltas' Rancho San Antonio continued after Alta California passed from Spanish to Mexican sovereignty after the Mexican War of Independence. However, the advent of U.S. sovereignty after the Mexican–American War, and especially, the Gold Rush, saw the Peraltas' lands quickly encroached on by squatters and diminished by dubious legal proceedings. The lands of the brothers Domingo and Vicente were quickly reduced to reservations close to their respective ranch homes. The rest of the land was surveyed and parceled out to various American claimants ("See" Kellersberger's Map).