It resulted in deaths of millions ranging from 75-200 million people. About 30% of Europe's population.
Because the war was wide spread and there was a need to supply millions of soldiers and sailors with the materials and machines they needed to fight. This was a true world war with fighting going on in much of the world .
As an example: the war in Europe might have lasted a year or two longer if it had not been for the ability of American to quickly produce all of the landing craft needed for the D-Day invasion.
Answer:
Depression and economic struggle.
Explanation:
After the first world was much of the world was in shambles. People where poor and starving. This is the perfect opportunity for a dictator to come along and say they can fix all of their problems and suddenly gain a ton of support.
Hope this answer helps :)