History of Peru warfare. The Revolutionary Left Movement (Peru), or MIR, launched an insurrection that had been crushed by 1965, but Peru's internal strife would only accelerate until its climax in the 1990s. The military has been prominent in Peruvian history. Coups have repeatedly interrupted civilian constitutional government. The most recent period of military rule (1968–1980) began when General Juan Velasco Alvarado overthrew elected President Fernando Belaúnde Terry of the Popular Action Party (AP). As part of what has been called the "first phase" of the military government's nationalist program, Velasco undertook an extensive agrarian reform program and nationalized the fish meal industry,
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