Changes

The Mongol conquests initiated by Genghis Khan, who united the often warring Mongol and Turkic tribes, in 1206 and continuing through his successors. At surface value, the destruction during the 13th century when these conquests took place was immense. Some have estimated that the Mongol invasions killed more people than any other war if one adjusted for global population levels, where up to 5% of the planet may have been killed during the invasions. Additionally, the invasions have been suggested as helping to begin the spread of the Black Death plague, as tactics used and movements of population may have helped the bacteria to more easily spread. Many of the great cities in East Asia, Central Asia, and West Asia were either destroyed or lost much of their cultural property. Cities as diverse as Kiev, Nishapur, Samarkand, and Baghdad were heavily damaged or destroyed. In some countries, it is estimated that nearly half the population died in the invasions and aftermath.