No FDR didn't. Actually he prolonged the depression with some of his decisions like price freezes and business protections. WWII got us out of the depression with government spending. Look up Keynsian economics. Militarily though he did fine. He saw the threat of Nazism before everyone else did.But FDR got the US out of the depression. You can say he did fine too. But if you are talking about the military intervention then that is another question.