Happy birthday! Best wishes, John Green. Unfortunately for the Mongols, those guys weren't always working together because Genghis Khan failed to create a single political unit out of his conquests. Instead, after Genghis's death, the Mongols were left with four really important empires called khanates. The Yuan Dynasty in China, the Ilkhanate in Persia, the Chagatai Khanate in Central Asia, and the Khanate of the Golden Horde in Russia. If you remember all the way back to the Hellenistic period, this is similar to what happened to another good general who wasn't much for administration, Alexander the Great. Also, neither of them ever conquered India.