which finally ended due to the massive industrial buildup of WW II...
That is a BIG myth. WWII did NOT end the depression. Everything that was build during the war was destroyed by the war.
No, you ARE wrong. Everything built in the United States survived the war. . . it's called industrial infrastructure built for the war effort that was put to work in other ways post war. The depression WAS ended by WWII as the unemployed were put to work manning the army, staffing the building of the industrial infrastructure to build millions of rifles, handguns, bayonets, 2.5 million machine guns, 2.4 million trucks and jeeps, over 180,000 tanks and self propelled guns, 325,000 military aircraft, 22 aircraft carriers, 8 battleships, 48 cruisers, 349 destroyers, 420 convoy escorts, and 203 submarines, as wells as hundreds of freighters. . . all in five short years. NONE of the plant, equipment, shipyards, and most of all skilled, trained hardworking labor in the USA was destroyed by WWII.
In addition, in Europe and Asia, the old infrastructure, out-moded, antique, no-longer able to compete, was often conveniently removed by twenty minute—in a couple of cases, twenty second—demolition efforts courtesy of the allies, making way for much more modern, more efficient plants and equipment that would in a very short time make them economic powerhouses competing with those who thought they had vanquished them. Hiroshima, Nagasaki, Dresden, all became amazing industrial centers when rebuilt.
All of this broke the back of the entrenched depression.