Being that this is a very vague question, I have to ask: What do you mean? Are you inquiring as to how the impact of economic conditions worldwide contributed to the eventual World War II? Are you asking how the "Great Depression", here specificied as the American Depression, contributed to America's participation in the war?

If you can elucidate your question a little, I'd be more than happy to provide you some information.

Due to very credible report from an anonymous source, I have removed this question on the basis of it being a homework question. Please read our rules before posting a question in the future.