What lead to the downfall of the Mongol empire?

In 1260 the Mongol empire was split up into four groups between Genghis's descendants, the Yuan Dynasty in China, the Golden Horde in Russia, the Ilkhanate in Persia and the Chagatai in Central Asia. The Yuan dynasty which was started by Qubilai Khan, ended in 1368, when the last Mongol emperor was driven out by native Chinese rebels.  The Mongol armies in China were no longer of a quality to be able to deal effectively with these problems. More important, there were not enough of them; and the fourteenth-century neglect and impoverishment of Mongolia itself had meant that few new recruits came in from Mongolia. The Ilkhanate fell because their wasn't an heir to the throne which meant that when the Khan died the government disintegrated as a result. The rest of the khanate fell under control from other warlords.







The Golden Horde from invasions from the ottoman empire and the Poland kings which were trying to take back their land. Also their leaders, the Batu family who ruled the Russian khanate for a century till 1360 died and their successors didn't have what it took to be leaders and couldn't manage the khanate. The Chagatai which survived the longest, fell because of the increasing revolts in the eastern provinces till 1346 when the Khan Qazan was killed by a tribe chief Qazaghan which marked the end of most of the khanate where only small remnants of Mongol towns where left for a few decades before they were all driven out.

So in conclusion the Mongols fell because of their fail of military leaders and inability to control revolts.

http://en.wikipedia.org/wiki/Chagatai_Khanate#End_of_Chagatayid_rule_in_Transoxiana
http://en.wikipedia.org/wiki/Golden_Horde
http://medievalnews.blogspot.com.au/2010/01/decline-and-fall-of-mongol-empire.html