[Charles Martel]

And by Pearl Harbor, we’d already been ramping up for war for almost two years. Conscription was already in place, and our factories had been cranking out tanks, ships and planes for Britain and the Soviet Union.

Yep, by 1939 Hap Arnold had already formed an agreement with the eight largest civilian flight instruction companies in the country to heavily ramp up training, with support from the military. A year later, 50+ primary flight training fields had been created or modified to meet military training needs around the U.S.
Actual training - as Arnold had envisioned - was under way one year before the attack on Pearl Harbor.

Field of Valor (Corsicana, Texas)

[dfwgator]

Everybody in the know knew the US getting in the war was inevitable once France fell, and the Japs were smelling blood in the water to take those colonies from the Brits, French and Dutch.