What were the stories about the Persian army that were circulating in 480 BCE?

Which factor has played the most important role in changing the way history is studied over time?

The formation of business monopolies in the late 1800s was made possible by the (1) effects of laissez-faire policies (2) passage of federal antitrust laws (3) elimination of the free-enterprise system (4) adoption of socialist economic practices

The federal goveremnt ability to draft people into the army is?