Why did Japan abandon its concession at Wangjiatuo in 1937?

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Chongqing Skyscrapers at night in central Chongqing, China.

Japan abandoned its concession at Wangjiatuo in 1937 due to the outbreak of the second Sino-Japanese War (1937–1945).1

Following the Marco Polo Bridge Incident on July 7, 1937, hostilities between China and Japan escalated into full-scale warfare. As the conflict spread, the Japanese concession at Wangjiatuo—which had been established in 1901 following the Treaty of Shimonoseki—was abandoned by Japan that same year.231