Republic of China (1912–1949)
Frustrated by the Qing court's resistance to reform and by China's weakness, young officials, military officers, and students began to advocate the overthrow of the Qing Dynasty and the creation of a republic. They were inspired by the revolutionary ideas of Sun Yat-sen. When Sun Yat-sen was asked by one of the leading revolutionary generals to what he ascribed the success, he said, "To Christianity more than to any other single cause. Along with its ideals of religious freedom, and along with these it inculcates everywhere a doctrine of universal love and peace. These ideals appeal to the Chinese; they largely caused the Revolution, and they largely determined its peaceful character."
A revolutionary military uprising, the Wuchang Uprising, began on 10 October 1911, in Wuhan. The provisional government of the Republic of China was formed in Nanjing on March 12, 1912. Sun Yat-sen was declared as President, but Sun was forced to turn power over to Yuan Shikai, who commanded the New Army and was Prime Minister under the Qing government, as part of the agreement to let the last Qing monarch abdicate (a decision Sun would later regret). Over the next few years, Yuan proceeded to abolish the national and provincial assemblies, and declared himself emperor in late 1915. Yuan's imperial ambitions were fiercely opposed by his subordinates; faced with the prospect of rebellion, he abdicated in March 1916, and died in June of that year.
Yuan death in 1916 left a power vacuum in China; the republican government was all but shattered. This ushered in the warlord era, during which much of the country was ruled by shifting coalitions of competing provincial military leaders.
In 1919, the May Fourth Movement began as a response to the terms imposed on China by Germany at the end World War I, but quickly became a protest movement about the domestic situation in China. The discrediting of liberal Western philosophy amongst Chinese intellectuals was followed by the adoption of more radical lines of thought. This in turn planted the seeds for the irreconcilable conflict between the left and right in China that would dominate Chinese history for the rest of the century.
In the 1920s, Sun Yat-Sen established a revolutionary base in south China, and set out to unite the fragmented nation. With assistance from the Soviet Union (themselves fresh from a socialist uprising), he entered into an alliance with the fledgling Communist Party of China. After Sun's death from cancer in 1925, one of his protégés, Chiang Kai-shek, seized control of the Kuomintang (Nationalist Party or KMT) and succeeded in bringing most of south and central China under its rule in a military campaign known as the Northern Expedition (1926–1927). Having defeated the warlords in south and central China by military force, Chiang was able to secure the nominal allegiance of the warlords in the North. In 1927, Chiang turned on the CPC and relentlessly chased the CPC armies and its leaders from their bases in southern and eastern China. In 1934, driven from their mountain bases such as the Chinese Soviet Republic, the CPC forces embarked on the Long March across China's most desolate terrain to the northwest, where they established a guerrilla base at Yan'an in Shaanxi Province. During the Long March, the communists reorganized under a new leader, Mao Zedong (Mao Tse-tung).
The bitter struggle between the KMT and the CPC continued, openly or clandestinely, through the 14-year long Japanese occupation of various parts of the country (1931–1945). The two Chinese parties nominally formed a united front to oppose the Japanese in 1937, during the Sino-Japanese War (1937-1945), which became a part of World War II.