Before Xerxes I invaded Greece, what did he first need to do?

Before launching his invasion of Greece, Xerxes had to secure the Persian Empire by suppressing revolts in Egypt and Babylon. The Ionian Revolt had already been put down during the reign of his father, Darius I, and the Royal Road already existed. Therefore, the correct choice is “defeat revolts in Babylon and Egypt.”

AI-written and checked against the verified answer.