Answer:
The Mongol Empire
Explanation:
The Mongol Empire was not bigger and stronger empire than American empire but also from all empires that were present in the history of the world. It captured about 23 millions kilometer areas whereas area of American empire is 9.8 millions kilometer which is less than half of the Mongol empire. Mongol Empire also had a strong and large military than any other empire. So we can say that Mongol Empire is bigger and stronger empire than American empire on the basis of size and military.
