Northern Expedition in the context of "Yan Xishan"

China, officially the People's Republic of China (PRC), is a country in East Asia. With a population exceeding 1.4 billion, it is the second-most populous country after India, representing 17% of the world population. China borders fourteen countries by land across an area of 9.6 million square kilometers (3,700,000 sq mi), making it the third-largest country by area. The country is divided into 33 province-level divisions: 22 provinces, 5 autonomous regions, 4 municipalities, and 2 semi-autonomous special administrative regions. Beijing is the capital, while Shanghai is the most populous city by urban area and largest financial center.

China saw the first humans in the region arriving during the Paleolithic era. By the 2nd millennium BCE dynastic states had emerged in the Yellow River basin. The 8th–3rd centuries BCE saw a breakdown in the authority of the Zhou dynasty, accompanied by the emergence of administrative and military techniques, literature and philosophy. In 221 BCE, China was unified under an emperor, ushering in two millennia of imperial dynasties. With the invention of gunpowder and paper, the establishment of the Silk Road, and the Great Wall, Chinese culture flourished and has heavily influenced its neighbors and lands further afield. China began to cede parts of the country in the 19th century, to European powers by a series of unequal treaties. The 1911 Revolution overthrew the Qing dynasty and the Republic of China was established the following year. The country was unstable and fragmented during the Warlord Era, which ended upon the Northern Expedition conducted by the Kuomintang to reunify the country.

The Chinese Civil War was fought between the Kuomintang-led government of the Republic of China and the forces of the Chinese Communist Party (CCP). Armed conflict continued intermittently from 1 August 1927 until Communist victory resulted in their total control over mainland China on 10 December 1949.

The war is generally divided into two phases with an interlude: from August 1927 to 1937, the First United Front alliance of the KMT and CCP collapsed during the Northern Expedition, and the Nationalists controlled most of China. From 1937 to 1945, hostilities were mostly put on hold as the Second United Front fought the Japanese invasion of China with eventual help from the Allies of World War II. However, armed clashes between the groups remained common. Exacerbating the divisions within China further was the formation of the Wang Jingwei regime, a Japan-sponsored puppet government led by Wang Jingwei, which was established to nominally govern the regions of China that came under Japanese occupation.

The Kuomintang (KMT) is a major political party in the Republic of China (Taiwan). It was the sole ruling party of the country during its rule from 1927 to 1949 in Mainland China until its relocation to Taiwan, and in Taiwan ruled under martial law until 1987. The KMT is a centre-right to right-wing party and the largest in the Pan-Blue Coalition, one of the two main political groups in Taiwan. Its primary rival is the Democratic Progressive Party (DPP), the largest party in the Pan-Green Coalition. As of 2025, the KMT is the largest single party in the Legislative Yuan and is chaired by Cheng Li-wun.

The party was founded by Sun Yat-sen in 1894 in Honolulu, Hawaii, as the Revive China Society. He reformed the party in 1919 in the Shanghai French Concession under its current name. From 1926 to 1928, the KMT under Chiang Kai-shek successfully unified China in the Northern Expedition against regional warlords, leading to the fall of the Beiyang government. After initially allying with the Chinese Communist Party (CCP) in the First United Front, the party under Chiang purged communist members. It was the sole ruling party of China from 1928 to 1949 but gradually lost control while fighting the Empire of Japan in the Second Sino-Japanese War and the CCP in the Chinese Civil War. In December 1949, the Kuomintang retreated to Taiwan following its defeat by the communists.

The Nationalist government, Nationalist regime and Nationalist China, officially the National Government of the Republic of China, refer to the government of the Republic of China from 1 July 1925 to 20 May 1948, led by the nationalist Kuomintang (KMT) under Chiang Kai-shek.

Following the outbreak of the Xinhai Revolution, revolutionary leader Sun Yat-sen was elected to be China's provisional president and founded the Provisional Government of the Republic of China. To preserve national unity, Sun ceded the presidency to military strongman Yuan Shikai, who established the Beiyang government. After a failed attempt to install himself as Emperor of China, Yuan died in 1916, leaving a power vacuum which resulted in China being divided into several warlord fiefs and rival governments. They were nominally reunified in 1928 under the Nanjing-based government led by Chiang Kai-shek, which after the Northern Expedition initially governed the country as a one-party state under the Kuomintang, and was subsequently given international recognition as the legitimate representative of China, with Chiang as a de facto leader of the country under a military dictatorship. The Nationalist government would then experience many further challenges such as the Second Sino-Japanese War, and the Chinese Civil War. The government was in place until it was replaced by the current Government of the Republic of China in the newly promulgated Constitution of the Republic of China of 1947.

Chiang Kai-shek (31 October 1887 – 5 April 1975) was a Chinese politician, revolutionary, and military commander who led the Republic of China (ROC) from 1928 until his death in 1975. His government was based in mainland China until it was defeated in the Chinese Civil War by Mao Zedong's Chinese Communist Party (CCP) in 1949, after which he continued to lead the ROC government on the island of Taiwan. Chiang served as leader of the Nationalist Kuomintang (KMT) party and the commander-in-chief of the National Revolutionary Army (NRA), which was reorganized into the Republic of China Armed Forces in 1947, from 1926 until his death.

Born in Zhejiang, Chiang received a military education in China and Japan and joined Sun Yat-sen's Tongmenghui organization in 1908. After the 1911 Revolution, he was a founding member of the KMT and head of the Whampoa Military Academy from 1924. After Sun's death in 1925, Chiang became leader of the party and commander-in-chief of the NRA, and from 1926 to 1928 led the Northern Expedition, which nominally reunified China under a Nationalist government based in Nanjing. The KMT–CCP alliance broke down in 1927 following the KMT's Shanghai Massacre, starting the Chinese Civil War. Chiang sought to modernise and unify the ROC during the Nanjing decade, although hostilities with the CCP continued. After Japan's invasion of Manchuria in 1931, his government tried to avoid a war while pursuing economic and social reconstruction. In 1936, Chiang was kidnapped by his generals in the Xi'an Incident and forced to form an anti-Japanese Second United Front with the CCP, and between 1937 and 1945 led China in the Second Sino-Japanese War, mostly from the wartime capital of Chongqing. As the leader of a major Allied power, he attended the 1943 Cairo Conference to discuss the terms for Japan's surrender in 1945, including the return of Taiwan, where he suppressed the February 28 uprising in 1947.

The First United Front, also known as the KMT–CCP Alliance, of the Kuomintang (KMT) and the Chinese Communist Party (CCP), was formed in 1923 as an alliance to end warlordism in China. Together they formed the National Revolutionary Army and set out in 1926 on the Northern Expedition.

The history of the Republic of China began in 1912 with the end of the Qing dynasty, when the Xinhai Revolution and the formation of the Republic of China put an end to 2,000 years of imperial rule. The Republic experienced many trials and tribulations after its founding which included being dominated by elements as disparate as warlord generals and foreign powers.

In 1928, the Republic was nominally unified under the Kuomintang (KMT; also called "Chinese Nationalist Party") after the Northern Expedition, and was in the early stages of industrialization and modernization when it was caught in the conflicts involving the Kuomintang government, the Chinese Communist Party (CCP), local warlords, and the Empire of Japan. Most nation-building efforts were stopped during the full-scale Second Sino-Japanese War against Japan from 1937 to 1945, and later the widening gap between the Kuomintang and the Communist Party made a coalition government impossible, causing the resumption of the Chinese Civil War, in 1946, shortly after the Japanese surrender to the Allied Powers in September 1945.

The Fengtian Government (Chinese: 奉系军阀; pinyin: Fèngxì Jūnfá; Wade–Giles: Feng-hsi Chün-fa) was the faction that supported warlord Zhang Zuolin during China's Warlord Era. It took its name from Fengtian Province, which served as its original base of support. However, the clique quickly came to control all of the Three Northeastern Provinces. The clique received support from Japan in exchange for protecting Japanese military and economic interests in Manchuria. The Fengtian Army frequently intervened in many of the conflicts of the Warlord Era.

Following the Zhili–Anhui War of 1920 and 1921, the Fengtian and Zhili cliques exercised joint control of Beijing and the Beiyang Government. Tensions soon began building between the two, resulting in clashes for control of Beijing known as the First Zhili–Fengtian War (1922). The Second (1924) Zhili–Fengtian War started later over the Zhili invasion of the remnants of the Anhui clique, which had become allies of the Fengtian Clique, which resulted in a Fengtian victory, with the Zhili clique retreating as far south as Henan. The power of the Fengtian Clique began to decrease in the midst of the Kuomintang's Northern Expedition. In 1928, while he was retreating North, Zhang Zuolin's Japanese sponsors blew up his train, killing him. After Zhang's assassination, his son, Zhang Xueliang, took over the leadership of the clique. He preferred to work with the Kuomintang rather than the Japanese and symbolically pledged allegiance to the Nationalist Government in Nanjing. In practice, the Fengtian clique continued to independently govern Manchuria until the Japanese invasion in 1931.