How did the Inca empire spread the Quechua language across Peru?

The Quechuan languages originated in a small area of the southern Peruvian highlands. Their geographical range expanded rapidly beginning around 1450, primarily driven by the military conquests of the Inca Empire.1

As the Inca expanded their control across the Andean highlands and along the Pacific coast, they utilized several methods to consolidate their influence and spread their language:

• Imperial Expansion: The Inca systematically conquered neighboring peoples, incorporating them into their realm and extending the reach of their administration and language.12
• Forced Resettlement: To ensure political stability and prevent revolt, the Inca implemented a policy of forced resettlement, moving large contingents of people throughout the empire. This practice helped distribute ethnic groups and facilitated the spread of Quechua among diverse populations.2
• Administrative Integration: The Inca established a vast network of roads that connected their empire, allowing for efficient communication and movement across the region. Following the Spanish conquest, colonial authorities further promoted the use of Quechua because it was convenient for government administration and missionary activities.23