Uh, the guy with 31 posts shouldn't be calling people noobs. It's bad form.
I suppose the hollocost, the moon landing and the first Gulf War didn't happen either did they?
Basically, Germany started the War by first invading Belgium... this was followed by war being declared ON Germany by England... blah blah blah, Japan joined the allies, France fell to Germany, the US Joined the Allies Germany was defeated.
The allies and most of Europe treated Germany like crap for a few decades fostering an intollerance within Germany for pretty much the rest of the world. This more or less led to the second World War.
I missed many major points but that'll give you a rough outline for your history paper.
Although next time you go trolling for flames try the Bait and Tackle forum.