On This Day - What happened 18 September 1931 AD

The internecine warfare in China provided excellent opportunities for Japan, which saw Manchuria as a limitless supply of raw materials, a market for its manufactured goods (now excluded from the markets of many Western countries as a result of Depression-era tariffs), and a protective buffer state against the Soviet Union in Siberia. Japan invaded Manchuria outright after the Mukden Incident in September 1931.

The Lytton Report appeared a year later (October 1932). It declared Japan to be the aggressor and demanded Manchuria be returned to China. The report passed 42–1 in the Assembly in 1933 (only Japan voting against), but instead of removing its troops from China, Japan withdrew from the League. In the end, as British historian Charles Mowat argued, collective security was dead.

In 1931 Empire of Japan staged the Mukden Incident as a pretext to invade Manchuria.