That is not a guarantee. We look at WW2 and think that what happened then will happen at any other time. But in WW1 the US had to borrow rifles from France. WW1 was a total disgrace as far as the US military industrial complex was concerned. I know I'm committing a bit of a sin, today marks the 107th anniversary of the end of WW1 and that end was possible because of the US involvement. But, uncharacteristically for the US, it was the manpower, not the arsenal of the US that decided the end of that war. And, yes, even at that time the US was the largest economy of the world.