Final answer:
The Inca Empire expanded through military conquest, cultural assimilation, and administrative control. They used weapons and strategic military tactics to conquer ethnic groups across the Andes Mountains, while also creating a unified religious and cultural identity. Their empire covered a large territory in South America.
Step-by-step explanation:
The Inca Empire was developed and expanded through a combination of military conquest, cultural assimilation, and efficient administration. They used advanced weapons and military strategies to conquer neighboring ethnic groups across the Andes Mountains. Additionally, the Inca created a new religious and cultural identity to unify their empire and maintain control over their subjects. Their empire covered a vast territory, including parts of modern-day Peru, Ecuador, Bolivia, Argentina, and Chile.