In what century did the mongols expand their territory into an empire

The Mongol Empire: Expansion of the Mongol empire from 1206 CE-1294 CE. During Europe's High Middle Ages the Mongol Empire, the largest contiguous land empire in history, began to emerge. The Mongol Empire began in the Central Asian steppes and lasted throughout the 13th and 14th centuries.

Explanation:

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.