Who wrote gods and generals, the killer angels, and the last full measure

Which describes the persian empire? choose all that are (a) the persian army defeated the athenians at the battle of marathon. (b) the persians avoided using ideas from the peoples they conquered. (c) cyrus allowed conquered peoples to keep their cultures. (d) darius i built a network of good roads for communication. choose all that are

What pact signed on 1949 reinforce that the united states would not return to an isolationist policy

Which best describes the impact of the crusades on european exploration?