The United States was brought into the second world war when in July 1941, President Roosevelt signed an embargo to stop all shipping to Japan. This was said to be in retaliation for the recent Japanese invasion of French Indo-China. Roosevelt's U.S. embargo cut off the Japanese oil supply, which would have quickly shut down Japan's entire economy. In late November 1941 the Japanese sent a written "war warning" through diplomatic channels to Washington, demanding that the embargo be stopped, or else American sites in the Pacific would be attacked in retaliation. That formal diplomatic warning was ignored and the U.S. made no reply. Just two weeks later the Japanese bombed the American embargo ships located in Pearl Harbor.
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