Why was the United States was so concerned with Japanese expansion in the 1940s?

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At the start of 1940 Germany and the Third Reich had already begun its spread and domination of Poland. While the United States was not yet a major player on the world stage, we still had a negative outlook on the expansion of Germany and the beginning of World War II. On September 27, 1940 Japan signed a treaty with Germany and Italy to become war allies. This allied Japan against the US as the US was also allies with England, France, and other direct enemies of the Nazi movement. 

One of the other significant reasons the US was opposed to their actions was the United States, while not having much of a hand...

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