Although our friends in Asia, Europe and Canada had been fighting the Axis for at least a year and a half, American corporations continued to trade with the fascists all the way up until the U.S. declaration of war. This 1941 article, published seven months prior to that day, goes into some detail on the matter; although corporations are not named, it is pretty easy to identify them by their products.
"One reason why America today is short of ships to fill Britain's desperate needs is [due to] the fact that for six years or more, Japan and her scrap agents bought almost every American cargo vessel placed on the auction blocks, using them for scrap to feed the blazxing steel mills of Nipon."
"What you may not know is that last year we sold Japan more goods than any other country except Britain, Canada and France, and we bought more goods from her than than from any country of the world except Canada. The plain fact is that the United States today is the foundation stone of totalitarian Japan's economy."
This explains why the people who visit the Chiang Kai-Schek memorial in Taipei come away believing that the only involvement that the United States played throughout W.W. II was the selling of gas to Imperial Japan...