The United States' military dominance over Germany during World War II can be attributed to a confluence of several key factors.

Chief among them was the sheer industrial might of the American economy, which was able to outproduce its German counterpart in nearly every category of war materiel.

At the onset of the war, the US boasted a GDP more than twice the size of Germany's, allowing it to mobilize far greater financial resources and industrial capacity to support its war efforts.

American factories cranked out over 300,000 aircraft, 86,000 tanks, and 2 million military trucks - staggering figures that dwarfed German production. - https://germanyfocusguide.com/blog/how-much-stronger-usa-than-germany-wwii/?unique_id_475ctexj

The Factors Behind America's Decisive Advantage Over Germany in WWII