The development of cities that were built by an earlier civilizations," since Mexico had been the home of some of the world's most advanced civilizations before the Columbian invasion. I hope this helps.
One of the main factors that allowed Native Americans in Mexico to settle cities larger than those in areas to the north was that Central America contained far more gold and riches that acted as currency and boosted the economy. Practically no gold was found in what is now the eastern United States.
