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Second Sino-Japanese War
Operation PX was the codename for a planned Japanese military attack on civilians in the United States, using biological weapons during World War II. Imperial Japanese Navy submarines were to launch seaplanes that would deliver weaponized bubonic plague, developed by Unit 731 of the Imperial Japanese Army, to the US West Coast. The planned operation was abandoned due to the strong opposition of General Yoshijirō Umezu, Chief of the Army General Staff. It was also known as Operation Cherry Blossoms at Night.
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