Wang Jingwei in the context of "Axis Powers"

The Axis powers, originally called the Rome–Berlin Axis and also Rome–Berlin–Tokyo Axis, was the military coalition which initiated World War II and fought against the Allies. Its principal members were Nazi Germany, the Kingdom of Italy and the Empire of Japan. The Axis were united in their far-right positions and general opposition to the Allies, but otherwise lacked comparable coordination and ideological cohesion.

The Axis grew out of successive diplomatic efforts by Germany, Italy, and Japan to secure their own specific expansionist interests in the mid-1930s. The first step was the protocol signed by Germany and Italy in October 1936, after which Italian leader Benito Mussolini declared that all other European countries would thereafter rotate on the Rome–Berlin axis, thus creating the term "Axis". The following November saw the ratification of the Anti-Comintern Pact, an anti-communist treaty between Germany and Japan; Italy joined the Pact in 1937, followed by Hungary and Spain in 1939. The "Rome–Berlin Axis" became a military alliance in 1939 under the so-called "Pact of Steel", with the Tripartite Pact of 1940 formally integrating the military aims of Germany, Italy, Japan, and later followed by other nations. The three pacts formed the foundation of the Axis alliance.

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 Northern Expedition was a military campaign launched by the National Revolutionary Army (NRA) of the Kuomintang (KMT) against the Beiyang government and other regional warlords in 1926. The purpose of the campaign was to reunify China, which had become fragmented in the aftermath of the 1911 Revolution. The expedition was led by Generalissimo Chiang Kai-shek, and was divided into two phases. The first phase ended in a 1927 political split between two factions of the KMT: the right-leaning Nanjing faction, led by Chiang, and the left-leaning faction in Wuhan, led by Wang Jingwei. The split was partially motivated by Chiang's Shanghai Massacre of Communists within the KMT, which marked the end of the First United Front. In an effort to mend this schism, Chiang Kai-shek stepped down as the commander of the NRA in August 1927, and went into exile in Japan.

The second phase of the Expedition began in January 1928, when Chiang resumed command. By April 1928, the nationalist forces had advanced to the Yellow River. With the assistance of allied warlords, including Yan Xishan and Feng Yuxiang, the nationalist forces secured a series of decisive victories against the Beiyang Army. As they approached Beijing, Zhang Zuolin, leader of the Manchuria-based Fengtian clique, was forced to flee and was later assassinated shortly thereafter by the Japanese. His son, Zhang Xueliang, took over as the leader of the Fengtian clique, and in December 1928, announced that Manchuria would accept the authority of the nationalist government in Nanjing. With the final piece of China under KMT control, the Northern Expedition concluded successfully and China was reunified, heralding the start of the Nanjing decade.

The Reorganized National Government of the Republic of China, commonly described as the Wang Jingwei regime, was a puppet state of the Empire of Japan in eastern China. It existed coterminous with the Nationalist government of the Republic of China under Chiang Kai-shek, which was fighting Japan alongside the other Allies of World War II. The country functioned as a dictatorship under Wang Jingwei, formerly a high-ranking official of the Kuomintang (KMT) party. The region it administered was initially seized by Japan during the late 1930s at the beginning of the Second Sino-Japanese War.

Wang, a rival of Chiang Kai-shek and member of the pro-peace faction of the KMT, defected to the Japanese side and formed a collaborationist government in occupied Nanjing in 1940, as well as a concurrent collaborationist Kuomintang that ruled the new government. The new state claimed the entirety of China (outside the Japanese puppet state of Manchukuo) during its existence, portraying itself as the legitimate inheritors of the Xinhai Revolution and Sun Yat-sen's legacy as opposed to Chiang's government in Chongqing, but effectively only Japanese-occupied territory was under its direct control. Its international recognition was limited to other members of the Anti-Comintern Pact, of which it was a signatory. The Reorganized National Government existed until the end of World War II and the surrender of Japan in August 1945, at which point the regime was dissolved and many of its leading members were executed for treason.

The Wuhan Nationalist government (Chinese: 武漢國民政府), also known as the Wuhan government, Wuhan regime, or Hankow government, was a government dominated by the left-wing of the Nationalist or Kuomintang (KMT) Party of China that was based in Wuhan from 5 December 1926 to 21 September 1927, led first by Eugene Chen, and later by Wang Jingwei.

Following the capture of Wuhan during the Northern Expedition, the Nationalist government based in Guangzhou moved there in December 1926. In April 1927, after National Revolutionary Army (NRA) commander-in-chief Chiang Kai-shek purged communists and leftists in the "Shanghai massacre", the Wuhan government split with Chiang in what is known as the "Nanjing–Wuhan split" (Chinese: 寧漢分裂). Chiang subsequently formed his own government in Nanjing. While Chiang continued the Northern Expedition on his own, increasing tensions between communists and the KMT in the Wuhan government resulted in a new purge of communists from that government, and an eventual reconciliation with the Nanjing faction, after which the government moved to Nanjing.

The Shanghai massacre of 12 April 1927, the April 12 Purge or the April 12 Incident as it is commonly known in China, was the violent suppression of Chinese Communist Party (CCP) organizations and leftist elements in Shanghai by forces supporting General Chiang Kai-shek and conservative factions in the Kuomintang (Chinese Nationalist Party or KMT). The event began the campaign of anti-communist repression in Nationalist China.

Following the incident, conservative KMT elements carried out a full-scale purge of communists in all areas under their control, and violent suppression occurred in Guangzhou and Changsha. The purge led to an open split between left-wing and right-wing factions in the KMT, with Chiang Kai-shek establishing himself as the leader of the right-wing faction based in Nanjing, in opposition to the original left-wing KMT government based in Wuhan, which was led by Wang Jingwei.