The major cause is the Germany was using submarines to sink down the American ships and killed all of the American soldiers, and that is why the U.S join the war and pay back... mark me brainlist please...
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)
C. Both involved superpowers ......
