What limits do Inca and Aztec perspectives after the Spanish arrival on American civilizations pre-1600 have as historical sources?

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Explanation:

Aztec was an Empire in Mexico and it took two years before the Spanish could conquer the Empire. Inca Empire was also conquer by the Spanish. The Empire today is located in the country of Peru.

Incal Empire was the largest empire in pre-Columbian America before it was conquered. Even after the conquest, Inca leaders continued to resist the Spanish up until 1572, when its last city, Vilcabamba, was captured.

Aztec Empire was also a great Empire, Hernan Cortés invaded Mexico in 1519 and conquered the Aztec Empire. Present-day Mexico City covers the area where the Aztec capital once stood

Spain was able to defeat Inca Emipre because of two reasons, the first is the civil war between two brother in Inca and the second is the possession of superior weapons.

It was also able to deafeat Aztec because of the superior weapons and the Citizens of Aztec also contribute to there downfall by welcoming them only for the Spanish to later turn against them.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.