Causes of the first period of the Chinese civil war By Ochoa59 1911 Establishment of the Chinese Republic 1912 Sun Yixian becomes provisional president of the republic 1915 Yuan attempts to become Emperor 1916 The warlord era begins 1917 Sun Yixian wanted to put a republic in Guangzhou 1921 The Chinese Communist Party (CCP) was formed. 1922 Between the GMD and the CCP was established an United Front 1925 Sun dies 1926 The GMD had a new leader: Jiang Jieshi 1928 Jiang declares the unification of China