Latin America–United States relations General Hugo Banzer overthrew leftist General Juan José Torres in 1971; in Uruguay, considered the "Switzerland" of South America, Juan María Bordaberry seized power in the 27 June 1973 coup. In Peru, leftist General Velasco Alvarado in power since 1968, planned to use the recently empowered Peruvian military to overwhelm Chilean armed forces in a planned invasion of Pinochetist Chile. A "Dirty War" was waged all over the subcontinent, culminating with Operation Condor, an agreement between security services of the Southern Cone and other South American countries to repress and assassinate political opponents, which was backed by the US government.
Juan Bautista Alvarado Frémont arrived in Monterey at the beginning of 1846. Afraid of foreign aggression, Castro assembled his militia, with Alvarado second in command, but Frémont went north to Oregon instead. An unstable political situation in Mexico strained relations among the Californios and it seemed that civil war would break out between north and south. On July 7, Commodore John D. Sloat occupied Monterey, declaring to the citizenry that the Mexican–American War had begun. Pico, Castro, and Alvarado set aside their differences to focus on the American threat, but by the end of August, Pico and Castro fled to Mexico, and Alvarado