The Incas used several methods to unify their large empire, including the use of a centralized government, a system of roads and communication networks, the imposition of a common language (Quechua), the implementation of a uniform system of weights and measures, and the promotion of a shared culture and religion centered around the worship of the sun god, Inti.
shorter
The Incas unified their large empire through a centralized government, a vast system of roads, a common language, standardized weights and measures, and a shared culture centered around the worship of the sun god, Inti.
