Population history of indigenous peoples of the Americas scope of the epidemics over the years was tremendous, killing millions of people—possibly in excess of 90% of the population in the hardest hit areas—and creating one of "the greatest human catastrophe in history, far exceeding even the disaster of the Black Death of medieval Europe", which had killed up to one-third of the people in Europe and Asia between 1347 and 1351. One of the most devastating diseases was smallpox, but other deadly diseases included typhus, measles, influenza, bubonic plague, cholera, malaria, tuberculosis, mumps, yellow fever and pertussis, which were chronic in Eurasia. This transfer of disease between the
Mexican Armed Forces was reorganized in 2007–09 into 30 Naval Infantry Battalions, a paratroop battalion, a battalion attached to the Presidential Guard Brigade, two Fast Reaction Forces with six battalions each, and three Special Forces groups. The Naval Infantry are responsible for port security, protection of the ten-kilometer coastal fringe, and patrolling major waterways. The Mexican Maritime Search and Rescue is the Mexican Navy's SAR Unit, which is responsible for improving the quality and effectiveness of the Navy's response to Mexico's maritime emergencies. The Mexican Navy historically has been responsible for the search and rescue operations using its available resources. However, aware of