You are confusing military power with industrial power. The US had industrial power before 1941, before 1911, starting in the 1890s. The US could turn that in

You are confusing military power with industrial power. The US had industrial power before 1941, before 1911, starting in the 1890s. The US could turn that into military power any time it wanted to, and in the time period between the world wars, it didn't want to. After 1941, it wanted to. Because of a lot of lies, but that's another discussion entirely.