Thanks, I didn’t realize that Russia was in an arms race at the time that threatened Germany.
Regarding subs, a bigger what if is the potential weapons Germany may have had if they had waited for 5-10 years. What made the invasion of Poland so vital as early as 1939?
Germany had the economic rebound advantage on so many other nations, obviously, the Depression was fully raging in the USA and would have lasted for many more years.
In 1939 German steel production was smaller than France or Britain, and much smaller than the U.S., or even Russia. The Germans could only win short wars. Even in a depression Pittsburgh was outproducing the Ruhr. (And Hitler drove the people most capable of and most motivated to make an atomic weapon to America.)
American industrial capacity, even in 1939, far outstripped Germany’s. And no country devoted nearly as much of its (already prodigious ) GDP to the war effort as the Americans. In 1943, 45% of the U.S. GDP was committed to war production. Hitler never called on the German people to make the kind of sacrifices that Americans made, until it was much too late. Current U.S. military spending is realistically less than 3% of GDP, when you discount social engineering disguised as military spending.