This was in part because the Germans were allied to the Japanese (though only had an informal agreement to support them militarily against the US, in part this was because the US was already involved in the ‘Battle for the Atlantic’ by extending the range of US influence to cover increasing amounts of territory. They were also operating ‘unrestricted submarine warfare’, which targeted any ship which might be bringing goods or men to Britain or other Allied powers. This included a great deal of American shipping and resulted in the sinking of many tonnes of US ships, the loss of US lives, and the sinking of two US Navy ships. Roosevelt was inclined to become involved, however, there was not widespread support from the US people or government until after Pearl Harbour and German declaration of war.
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