What was the main challenge the incas faced?

The main challenge the Incas faced was the vast and diverse geography of their empire, which spanned from the coastal deserts to the high Andes mountains. This rugged terrain made communication, transportation, and administration difficult. Additionally, they had to manage resources effectively to support their population across various climates and ensure food security. The Inca Empire also faced external threats from rival civilizations and internal strife, which complicated their governance and stability.