Funny story... (Hitler was incredibly gullible) [View all]
How the USA ended up at war with Germany is one of the many instances of Hitler getting punked by his supposed friends.
At the time of Pearl Harbor Germany was very much at war with Russia, in THE war for national survival that was always what WWII was about.
It was worked out that if ally Japan found herself at war with America that Germany would also declare war on America in exchange for Japan declaring war on Russia.
Germany could surely have used a second front in the Russian war.
So Japan attacked us. We declared war on them. Germany declared war on us, which is probably what it took to get us to declare war on Germany.
And when the dust settled... whoops! It turned out Japan somehow didn't have any good reason to decalre war on Russia. (Russia declared war on Japan later, after she was on the way down, in hopes of nabbing some islands. One of many, many reasons we wanted Japan over quick was that we did not want Russian help invading Japan. Can you imagine North Japan and South Japan? Oy!)
Hitler was so bad at allegiances. His best buddy Italy surrendered to us before we ever set foot on the Italian mainland and Germany had to come in to defend Italy from itself...