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