Why did the United States enter WWII, and what were the consequences at home and abroad?

Why did the United States enter WWII, and what were the consequences at home and abroad?
Support your argument with historical information in a multi-paragraph essay with a minimum of 300 words (include introduction, body, and conclusion paragraphs.)
Follow English grammar standards and rules, use Times New Roman size 12 font, and double-space your essay. Include a minimum of two credible, scholarly sources (your textbook is fine, too).