Good job, but, uhhh, one thing. It wasn't a pre-emptive war. Hitler declared war on us in support of his ally, Japan.
What you COULD write about was before the war: We committed provocative acts against both the Japanese (cutting off oil and scrap) and the Nazis (supplying the Brits, protecting convoys, etc). "Why do they hate us? WAAAAH!"
I am not the actual author, but perhaps he, or someone else, will respond in detail.
What can I say? Everything is the "cause" of something. Son of Sam killed people because he thought a neighbor's dog told him so. People have to judge for themselves whether the "reason" for an action was a justified one.
Saddam was already at war with us, as well -- he had been since Gulf War I.