Answer:
Many activists joined effort to reform local government, public education, medicine, finance , insurance , industry, railroad track , churches, and many other areas. Progressive transformed, professionalized and made "scientific" the social sciences, especially history, economics, and political science.
Economic distress and resentment of the treaty within Germany helped fuel the ultra-nationalist sentiment that led to the rise of Adolf Hitler and his Nazi Party, as well as the coming of a second World War just two decades later.
This is because it was when the Allies were able to defeat the Axis powers, which gave hope to the Allies to fight stronger. Also, when they defeated Axis powers at that battle, they(ALLIES), now had vantage points on both sides of Germany; east(UK) and west (Russia).
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