Citizen involvement in local environmental groups and long-standing organizations
such as the Sierra Club, the Audubon Society, and the Wilderness Society declined after the first
Earth Day true or false?

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