Ignoring the trolls-
Plan Rainbow Five was FDR's leaked plan to invade Europe with a force of 5 million to get Hitler. It was leaked I believe by the Chicago Tribune which is actually referenced by Hitler in his speech. Regardless of whether it was a declaration of war or not, Hitler clearly knew what was coming and FDR wanted him to know.
Another interesting scheme, though not entirely on topic, is the Morgenthau Plan to force Germans into neo-agriculturalism and strip all of Germany of its industry so it couldn't try ruling the world again. Of course this plan also would have starved 20 million German people and killed millions as well. Even the Communist spy Harry Dexter White thought it was too extreme.
Another ignored chunk of history is the forced expulsion of ethnic Germans. The United States, Great Britain and USSR carried out the largest forced relocation in human history by ripping 14 million people from their homes in Czechoslovakia, Hungary, Romania, Yugoslavia and Poland and planting them in Germany. Half a million died from starvation and disease, tens of thousands from beatings and mistreatment. Oh and concentration camps. Yeha the Allies used slave labor like the Nazis after the Holocaust ended. No really. The Nuremberg trials were happening while we did this. In Winston Churchill's own words it was ethnic cleansing or as he put it "the total expuslion of the Germans..."
But I'm rambling. If anyone wants a better argued pov than I can give on the reason we went to war with Germany, I found a cached article by the author of Hitler Attacks Pearl Harbor - Richard Hill. Here's the article-
http://webcache.googleusercontent.co...ient=firefox-a