Second Sino-Japanese War | Summary, Combatants, Facts, & Map

The establishment of Manchukuo and the creation of the United Front

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For much of the early 20th century, Japan had exercised effective control of Manchuria, initially through the terms of the Twenty-one Demands (1915) and later through its support of Chinese warlord Zhang Zuolin. However, a serious conflict was developing, and the Chinese in Manchuria were especially restive under the privileges held by the Japanese. Chinese citizens formed the vast majority of the population, and the legal title of the region was held by China. Yet Japan controlled much of south Manchuria through its railways and its leasehold on the Liaodong Peninsula and in other ways that compromised Chinese sovereignty.

In an attempt to assert their independence, the Chinese began building a series of railroads that would in part encircle the Japanese lines and terminate at Huludao, a port which the Chinese were developing. Zhang Xueliang, Zhang Zuolin’s son and the ruler of Manchuria after his father’s murder by Japanese officers in 1928, was increasingly disposed to ally himself with the Kuomintang (Nationalist Party) and its desire to rid China of foreign control. In the summer of 1931 the friction expressed itself in minor incidents. Those in control of the main body of Japanese forces in Manchuria believed that the time had passed for temporizing and compromise. On the night of September 18–19, 1931, alleging that Chinese had blown up part of the track of the South Manchuria railway near the city, the Japanese seized Mukden (Shenyang). Facing little resistance from Nationalist forces, the Japanese established the puppet state of Manchukuo in 1932 and installed the deposed Qing emperor Puyi as its titular head. Japan soon demonstrated that it was not content with confining its control of China to regions north of the Great Wall, and in the spring of 1934 a pronouncement from Tokyo in effect declared all China to be a Japanese preserve in which no power could take important action without its consent.

In 1935 the Japanese forced the withdrawal from Hebei and Chahar (now part of Inner Mongolia) of any officials and armed forces that might prove unfriendly to Japan. These territories passed partly into Japanese control, and Suiyuan, Shansi (Shanxi), and Shantung (Shandong) were threatened. Nationalist leader Chiang Kai-shek did not offer open opposition, preferring instead to pursue his campaign against Chinese communist forces. In December 1936, in what came to be known as the Xi’an Incident, Chiang was seized by forces under the command of his own generals and compelled to ally with the communists in a United Front against Japan.

What proved to be a life and death struggle soon broke out between China and Japan. The opening engagement was a minor clash between Chinese and Japanese troops at the Marco Polo Bridge, not far from Peiping (Beijing) on July 7, 1937. The conflict quickly ceased to be localized. The Japanese came to feel that since Chiang and the Nationalist government would not yield to their wishes they must be eliminated. To the Japanese, the rising tide of nationalism in China—directed, as much of it was, against them—had become intolerable.

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