The Largest Contiguous Empire to Date
The Mongol Empire consisted of about 33.2 million square km at its height, and 25.60% of the worlds population (110.0 million out of 429 million). This means that the Mongol Empire is the largest contiguous land empire in human history.
This shows troop movements during the time of Genghis Khan.
http://en.wikipedia.org/wiki/Genghis_Khan |
This shows the expansion of the mongol empire until it's largest point.
http://en.wikipedia.org/wiki/Genghis_Khan |
Background
Mongolia was a collection of tribes and factions. They created alliances and fought wars with each other on the mere whims of chieftains and the people. Anarchy reigned outside of the normal bounds of state. There was no one who could unite the factions, until Genghis Khan.