The Incas unified their large empire through the construction of an extensive road system, the imposition of their language and religion, the use of a centralized government, and a powerful military to conquer and control other peoples. These methods created a sense of order, shared beliefs, and fear and respect for Inca rulers, which helped to maintain unity in the empire.

Additionally, the Incas implemented a system of forced labor known as mit'a, which required each household to contribute a certain number of workers to the state. This labor force was used for various purposes, including the construction of infrastructure, such as the road system and agricultural terraces, as well as for the maintenance of the empire.

The Incas also promoted the worship of Inti, the sun god, and the belief in the divinity of the Inca ruler, who was considered a descendant of Inti. By imposing their religion, the Incas were able to create a sense of shared beliefs and loyalty to their rulers. In addition, they incorporated conquered peoples into their empire, allowing them to retain their own local religious practices as long as they also worshipped Inti and acknowledged the supreme authority of the Inca ruler.

The centralized government played a crucial role in maintaining unity within the empire. The Inca emperor, known as the Sapa Inca, held supreme power and was assisted by nobles and administrators who helped govern different regions of the empire. This centralization of power allowed for efficient decision-making, consistent enforcement of laws, and the implementation of standardized practices and systems throughout the empire.

The Inca military was highly organized and capable of capturing and controlling new territories. They used a combination of military strategy, alliances, and intimidation tactics to conquer neighboring peoples. Additionally, conquered peoples were often resettled in strategic locations or integrated into Inca society in order to minimize resistance and foster loyalty to the empire.

Overall, the Incas employed a range of methods to unify their empire. Through infrastructure development, imposing their language and religion, a centralized government, and a powerful military, they were able to create a sense of order and shared identity among a diverse population. This unity contributed to the stability and longevity of the Inca Empire.

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The Inca Empire achieved unity through an extensive road network, the imposition of their language and religion, a centralized government, and a powerful military. These methods created order, shared beliefs, and fear of Inca rulers, maintaining unity in the empire.