Answer:
WWI left the company poorer and economic woes caused resentment amongst its population. The Great Depression of the 1930s and a collapse in international trade also worsened the economic situation in Europe, allowing Hitler to rise to power on the promise of revitalization
I don't know if your teacher would like this but there are no good guys or bad both killed for there own agenda or reasons
I believe that it would be england and france.. then again they have been fighting sence they both became countries