"The Soong Sisters" presents one interpretation of the 1936 Xi'an Incident as the event was never documented.Other pivotal moments include the founding of the Republic of China in 1911, the Kuomintang's Northern Expedition in 1926–27 against the Beiyang government and other warlords, and the 1931 Mukden Incident which marked the outbreak of the Second Sino-Japanese War.