Indigenous peoples of the Americas Smallpox killed from one third to half of the native population of Hispaniola in 1518. By killing the Incan ruler Huayna Capac, smallpox caused the Inca Civil War of 1529–1532. Smallpox was only the first epidemic. Typhus (probably) in 1546, influenza and smallpox together in 1558, smallpox again in 1589, diphtheria in 1614, measles in 1618—all ravaged the remains of Inca culture. Smallpox killed millions of native inhabitants of Mexico. Unintentionally introduced at Veracruz with the arrival of Pánfilo de Narváez on April 23, 1520, smallpox ravaged Mexico in the 1520s, possibly killing over 150,000 in Tenochtitlán (the heartland of
Mexican Armed Forces called "The dirty war" in the 1960s, which included the 1968 Tlatelolco massacre of students and unsuspecting bystanders. After 1980 these types of operations had nearly completely ceased (see EZLN). DN3: (Defense against natural disasters). The Army should always be ready to help the civil population in case of disaster. This includes preventive measures. For example, between August and November, military forces are sent to Mexican coastal areas to aid the public in the event of hurricanes or floods. For the Mexican people, the DN3 plan is the most important peacetime operation of the Army. The Army provides food, shelter,