What brought the world to ww2 after ww1

 What were the 4 major catalysts that brought the world back to war so quickly following the conclusion of The Great War in 1918? Be sure to apply proper Chicago Manual of Style notations in your paper, utilizing footnotes and a full bibliography at the end of the paper with all of your sources listed. Papers should be double-spaced, with standard 1-inch margins and a 12 point standard font