The Greco-Persian Wars were two conflicts that occurred between 490 and 479 BCE and pitted the Persian Empire against the Greek city-states. The conflict began after Athens and Eretria gave assistance to the Ionians in their rebellion against Persia and its ruler, Darius. (got the answer from google hehe)
separation of powers. A fundamental principle of the United States government, whereby powers and responsibilities are divided among the legislative branch, executive branch, and judicial branch.
