I'm talking with my girlfriend and she stated that America was a direct cause of WW2 and Hitler's Rise. The Wall Street crash and subsequent calling in of loans was the most direct reason and not (What I was led to believe) the Treaty of Versailles?

It seems that the only thing I can find on this is "controversial" topics about it, but my girlfriend presents a very strong case for it but as I said, I was under the assumption anger of the Treaty of Versailles was more responsible.