Final answer:
The Inca government unified their empire through a centralized administration, enforced religious practices, and an impressive infrastructure, including a vast road network and communal labor systems like the mita and ayllu.
Step-by-step explanation:
The Inca government implemented several strategies to unify the vast territories of their empire. They appointed their own governors to oversee provinces and conducted audits ensuring local governance adhered to Cuzco's policies. Despite central oversight, there was a degree of local autonomy with provincial administration run by local people. The religious practices were also a unification tool, with the empire-wide worship of Inti, the sun god, promoted alongside respect for local deities. The Inca's extensive road network, infrastructure projects, and the mita labor system showcased their organizational prowess, while the mita also required peasants to contribute labor to the state for public works, in return for protection and aid in times of famine. The ayllu system facilitated communal labor and crop production, further bolstering economic and social unity.