<Table> <Tr> <Td> </Td> <Td> 1206--1368 </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> 1206--1368 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="3"> Expansion of the Mongol Empire 1206--1294 superimposed on a modern political map of Eurasia . </Td> </Tr> <Tr> <Td_colspan="2"> Capital </Td> <Td> <Ul> <Li> 1206--35 Avarga </Li> <Li> 1235--60 Karakorum </Li> <Li> 1260--1368 Khanbaliq (Dadu) </Li> </Ul> </Td> </Tr>

What was the final extent of the mongol empire how and why did it end