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Japan's invasion of China marks the beginning of hostilities in the Pacific.
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Japan forms an alliance with Germany and Italy, strengthening its military position.
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The United States responds to Japanese aggression by imposing severe economic sanctions, including an oil embargo
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Talks between the U.S. and Japan fail, with the U.S. demanding Japan's withdrawal from occupied territories.
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Japanese forces launch a surprise attack on Pearl Harbor, targeting ships and naval bases.
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Following President Roosevelt's "Day of Infamy" speech, the U.S. officially enters World War II by declaring war on Japan.
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Germany and Italy declare war on the United States, expanding the conflict to a global scale.