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The Second Sino-Japanese War (July 7, 1937–September 9, 1945) was a major war fought between the Republic of China and the Empire of Japan, both before and during World War II. It ended with the surrender of Japan in 1945. The Japanese invasion was a strategic plan made by the Imperial Japanese Army as part of their large-scale plans to control the Asian mainland. The early manifestations of this plan were commonly known as "China Incidents", and according to Japanese propaganda of the time, were referred to as "incidents" supposedly provoked by China, in order to downplay Japan's illegality in these invasions. The 1931 invasion of Manchuria by Japan is referred to as the Mukden Incident. The last of these was the Marco Polo Bridge Incident of 1937, marking the official beginning of full scale war between the two countries. From 1937 to 1941, China fought alone. After the attack on Pearl Harbor, the Second Sino-Japanese War merged into the greater conflict of World War II.