Now that is rich. The first time I have been accused of being too brief. Look! Two sentences. No, three (or is it four). Wait, is this five? Or maybe six. Now I'm confused.
One of the worst things he did was almost cost us the war in the Pacific because he refused to admit that our interest lay there and not in Europe. He sent most war materials to Europe in the early days of the war and left the guys in the Pacific hanging, Guadalcanal is a case in point.
He had his head shoved so far up Churchill's butt that he couldn't see daylight. The war in Europe would never have happened if England and France would have shown some guts in the beggining and stood up to Hitler.
Even so, the English would have won it without our help, because Russia would have beaten Germany eventually and the English would have been able to land in France after Germany was beaten down a little more by Russia. We could have stayed out of the European war altogether and ended the Pacific war sooner, but FDR did things his, illegal, way and screwed the US in the process and we are still paying for his blunders and stupid social programs.