尽管很难劝服一战过后士气低落的美国民众再次参战，美国对轴心国的战争，早在珍珠港事件之前便已展开，只是无形罢了。
While it was hard to convince the American public to go to war again after its demoralizing participation in World War I , the US was already fighting a shadow war against the Axis powers for years before Pearl Harbor .
难战