What time period from 1910-1950 best describes the history of the United States?

What time period from 1910-1950 best describes the history of the United States?

I would like an essay about World War 2 and how important it was to the United States and how it affected us as a country. Mention Roosevelt, Great Depression, Harry Truman, Hitler, Japan, Axis Powers vs Allies, First and Second New Deal.