> After the war ended, cooler heads prevailed and all wartime orders were lifted and capital and labor could reform, as it saw fit, and as such, the year immediately following the war produced the greatest annualized economic gains in the history of the country

the reason the US was ably to basically jump start it's economy after ww2 was mainly because all of its competitors got either got their industries and cities literally leveled, or their nation/people nearly utterly destroyed.

Even the UK, which was a victor of world war 2 had an economy which was basically dead in the water until the late 70's.

The US got incredibly "lucky" during world war 2 in the sense that it didn't fight the conflict on its own continent.

Also, the marshall plan was a smart policy in an economic sense because it allowed the war economy to transistion back into civilian goods thanks to having a massive (subsidized) export market.