What three groups were essential to the Spanish colonization in the Americans

Incas, Mayans and Aztecs.

Explanation:

The Spanish colonization was characterized by the modification of the political, economic and religious structure of the societies that lived in that territory. These societies were groups of enormous importance for the Spanish colonization to be established in America. These groups were the Mayas, the Incas, and the Aztecs, who were civilizations with great wealth, technology, and organization. The Spaniards had to fight these peoples for the American territory, causing these groups to succumb and allowed the Spanish colonization to advance.

Answer: The Incas in the territory that is now Peru and the Mayans and Aztecs in Mexico and Central America.

Explanation: The conquistadors were astonished by what they found; a lot of gold and silver, amazing cities with great architecture, and incredible scientific achievements.