What did incan emperors force conquered peoples to do in order to unify their empire?

Answer: The Incan emperors forced the conquered people to speak Quechua, which is the Incan lanquage.

Explanation: The Inca empire was the largest empire in pre-Columbian America and their civilization arose from the Peruvian highlands sometime in the early 13th century. They were conquerors who employed different methods to unify their empire.

In addition to forcing them to use the Inca language, rebellions were avoided by transporting conquered peoples to different parts of the empire thereby averting would-be rebellions.

They had an advanced system of roads that held and linked the empire together, with some of their roads, walls and irrigation systems still in use till date. These were mostly done using mit'a which was the system of conscripting labor from villages.