NEED HELP WITH 16-19!! Please

The answer b is correct this all occurred during the red scare

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

Herodotus views history as a source of moral lessons, with conflicts and wars as misfortune. herodotus, preferred moral lessons and drawing conclusions over fact, making him similar to other popular historians of the time. thucydides uses factual reports of political and military events, based on eye-witness accounts. thucydides' view of only factual based reports, was uncommon for the time, neither thucydides or herodotus, cited sources.