How did the Persians build a strong empire? by building public libraries
by using a common currency
by enslaving conquered people
by supporting new technologies

Arguments supporting and opposing the supreme court decision citizens united v. federal election commission identify two reasons why some supporters of the decision consider it a victory for free speech.

Look at the graph. where p is price and q is quantity, what might cause a move from b to a?

Who was the top of the feudal system hierarchy