The attack on Pearl Harbor drew the U.S. into World War II once and for all. Why did Japan initiate the attack?

Answer The U.S. was trying to prevent Japan's global expansion

Japan's attack on Pearl Harbor was a preventative measure intended to keep America's Pacific Fleet from injecting themselves into the country's Southeast Asia military actions. The U.S. and Japan had been butting heads for nearly a decade, with the U.S. passing economic sanctions on Japan to prevent the country's global expansion. But instead of keeping the U.S. from interfering, the Pearl Harbor attack provoked them, and the nation officially declared war.

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