What event led to the Persian Empire invading Greece? The Spartans attacked Persia to defend Athens.
The Athenians attempted to kill Darius I to end his rule.
The Ionians revolted against Persia with the support of Athens.
The Persians attacked Greece to free Ionia from the rule of Athens.

How did the russian revolution impact world war i? a) the russians required the allied powers to come to their aid and defeat the radical groups. b) the russians pulled out from the war, enabling the germans to focus on the western front. c) the russians created new technological advancements that were used by the allied powers to win. d) the russians created a new communist government that aligned with the central powers instead.