Describe how the civil rights movement affected the integration of Oklahoma’s schools and other public places

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

The middle? there are 4 pieces. which piece are you talking about? the 2nd or 3rd?