Roosevelt provoked the attack on Pearl Harbor to get us into the War. Read “day of Deceit” it will open your eyes
And then cleverly managed to make Germany declare war on us. Germany immediately became the priority after they declared war on the United States, why arrange things so that Japan attacks if your real goal is to fight Germany? Yes, Japan and Germany were allies, but Japan certainly didn't attack the Soviet Union when Germany did, so how could FDR have known Hitler would declare war on the U.S.?
I've never understood why, if FDR "arranged" things, it was necessary for us to have our pants around our ankles at Pearl Harbor. The political purposes could have been served just as well if the alerted American forces destroyed the attackers. The Japanese would still have been proven to have started things.