What events led to the persian wars?

Persia took control of Ionia

Ionains revolted with the support of Athens

Darius I wanted to punish Athens so he attacked Greece.

Athens and Sparta joined together to fight the Persian Wars

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.