The size and sophistication of native american civilizations in mexico and south america can be attributed to

The size and sophistication of native America civilizations in Mexico and South America can be attributed to the development of agriculture. 13. The crop that became the staple of life in Mexico and South America was corn. 14. Native American (Indian) civilization was least highly developed in North America. 15. One of the main factors that enabled Europeans to conquer native North Americans with relative ease was the absence of dense concentrations of population or complex nation-states in North America