WWII makes a dramatic difference in American economy and life. 1933 the national dept of the GNP were 3% 1938 it were the same whit five years of new deal. 1944 it were 40% of the GNP. 12 million men served in US army (navy etc) but the workforce in USA grew by 10 million to 1944 from 1938. Unemployment was reduced from 19% 1938 to less than 2% 1944.
Do you mean national debt in the first part?
All this is true, but I'm not sure it means what you're thinking it does.
The gap between rich and poor narrowed dramatically in the area of nutrition, because food rationing and price controls provided a reasonably priced diet to everyone.
Why wouldn't they have had this beforehand? The government didn't give rations out, after all.
After WWII USA is the largest economy in the world, not bombed to pieces, whit the marshal plan and Bretton Woods system they jumpstart the international economy but is one of the few country’s Europe (and the world) can by much needed consumer goods and machine parts from.
On the other hand, it's not like the Europeans have much to buy stuff with. Certainly they have less money than they would if there was no WW2.
No Nazis, no WWII, makes all of this go away. There is no other need for the America to changes its political economy than unemployment and week growth.
"Between 1933 and 1937 real GNP in the United States grew at an average rate of over 8 percent per year; between 1938 and, 1941 it grew over 10 percent per year.""
What Ended the Great Depression?
Author(s): Christina D. Romer
Source: The Journal of Economic History, Vol. 52, No. 4, (Dec., 1992), pp. 757-784
Meanwhile, unemployment, corrected to include workers in government jobs as employed workers, is down to around 10%.