When Germany fell, the US was producing 10,000 fighters + bombers PER MONTH!
The Germans’ various rifle factories were producing Mauser 98s at the planned rate of 10,000 per month. At its peak, Springfield Armory alone (which had been tooled up more like a modern auto plant than a rifle factory) was cranking out about 4,000 M1 Garands a day.
We produced so much ammunition that .45ACP from WW2 was still in stock into the 80s (albeit repackaged in the 1960s), and .50 BMG ammo from the 1940s turned up in inventory as late as the Gulf War. Fortunately, there were a few troops that still knew how to work with corrosive primers....