Factors that contributed to mongol succes were their skills and brutality they had from being nomadic pastoralists. Mongol have some skill, their skill with horseback riding that no other settled agrarian society would have had cause to develop.
The largest contiguous land empire in history of 13th and 14th was Mongol Empire. Mongol were very brutal, Mongol would kill anyone if they are not submit to Mongol. So that, the other people who heard it will submit to the Mongol's rules because they are afraid of being killed by Mongol. That conditions make Mongol success in building the largest based empire in human history.
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