@Walter Hinteler,
Hitler accurately judged the lack of a spine in Neville Chamberlain, and his French allies. The Brits and the French could have launched an invasion of Germany, which would have actually been an act in accordance with a mutual defense pact with Poland. They didn't do a goddamned thing.
I was actually inaccurate in my last post. FDR didn't declare war on anyone--he didn't have the power to declare war. He went to the Congress to ask for a declaration of war, because Congress has that power, not the President. In 1939, it would have been political suicide for him to have asked for a declaration of war against Germany. He wouldn't have got it, and the Repulicans would have danced with glee, because he would have ruined his re-election prospects, and would have badly hurt the Democratic Party. This is not the first time that Izzy has trotted out that old bullshit to the effect that the United States prolonged the war in Europe by not declaring war on Germany in 1939. Even if, by some miracle, FDR could have gotten a declaration of war out of Congress, in the nine months before the invasion of France, the Americans would have had just enough time to raise a small army, equip it, and send it across the pond in time to join the evacuation from Dunkirk.
A Franco-British invasion of Germany in September 1939 would have seriously damaged Hitler's political capital, and it would have relieved the pressure on Poland. This is just more of Izzy's obsessive hatred of the United States.