Respuesta :
One of the things that allowed native americans in Mexico to settle cities larger than those in areas to the north was "b. 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 believe the answer is: b. the development of cities that were built by an earlier civilization
The earlier civilisation in mexico is most commonly known as the Aztecs. In the past, Aztecs were known as one of the most advanced civilisation and known for their development in agricultural technologies (most notably their irrigation system). Native american that came to this area could directly used things that are left over from the past civilization.
