At Ford's Willow Run plant near Detroit, by 1944, American workers were rolling one B-24, 4-engine bomber off the assembly line every 56 minutes.
Such feats of industrial production were repeated from one end of this country to the other and all of that happened DURING WORLD WAR II.
Americans were building tanks, ships, aircraft, small arms and munitions at speeds and in quantities virtually unimaginable before that time.
The "hard times" of World War II were voluntarily endured in a massive cooperative effort to support our fighting men and end the war, with victory, as soon as possible.
The war effort proved to Americans they could overcome enormous obstacles and bring victory and secure freedom from tyranny while demonstrating unprecedented industrial output.
You are making the mistake of equating the cooperative sacrifices of Americans during World War II with the malaise of the 1930's. The two things are not the same.
World War II produced an economic output miracle in the United States which carried this country to victory.
So much of what Detroit produced in 1944 was destroyed, either in battle, or in the boneyards of spent junk after the war. You are equating government war spending with economic growth, but the two are not the same. American industry committed stupendous feats of production and ingenuity that were unmatched by any other mortal, but it was done to win a war. Our losses far exceeded any gain that war "stimulus" spending is purported to have obtained. As far as getting us out of the Depression, well, all we really got was the worst war in history and a ruined world, probably a bad trade.