Sparta wanted to overthrow the Athenian oligarchy. Athens wanted to become the most powerful city-state in Greece. Sparta and its allies felt threatened by Athens's growing power.
That would be the Louisiana purchase of 1803.
It would be that "d. They worshipped one god who was believed to control nature and agriculture" that is not a true statement about the Indus Valley civilization, since in fact there were multiple religions in the region.
A fight that the U.S. joined to solve conflicts with other countries.