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In page Second Sino-Japanese War:

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Following the attack on Pearl Harbor, the United States declared war against Japan, and within days China joined the Allies in formal declaration of war against Japan, Germany and Italy.[citation needed] As the Western Allies entered the war against Japan, the Sino-Japanese War would become part of a greater conflict, the Pacific theatre of World War II. Japan's military action against the United States also restrained its capacity to conduct further offensive operations in China.[1]: 30