@Tinker:
CC is right about the many powerful friends in Germany, as well as national heros, Charles Lindberg the only american aviator decorated by the Nazi party. But by the end of 1940 those friendships were strectched thin and corporations were seeing a cash flow problem down the line.
Ahm, there is a small problem.
Three of the leading industrials in the US ( Henry Ford of Ford, James Mooney of General Motors and Thomas Watson of IBM, providing the administrative backbone for the Holocaust, which they stopped not much before the declaration of war) received medals of honor from the Third Reich, Watson even got the highest medal that could be given to foreigners.
It seems to be the strategy of the USA to locate an enemy… then support the enemy of the enemy (like Hitler against Communists and Social Democrats, the Taliban against the Soviets, the Iraq against the Iran, what was the guy in Panama called again), make them big and nice and fat, and then smash them to pieces once they dirft off the line given by the US, and take more or less full control over the territory the former friend, then enemy controlled.
(I also found a list of the all interventions the US did, the conclusion of that: they are a warmongering country)