A report on Republic of China (1912–1949), Chiang Kai-shek and Chongqing

The Second Sino-Japanese War (1937–1945) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan.

After failing to stop the Japanese in the Battle of Wuhan, the Chinese central government was relocated to Chongqing (Chungking) in the Chinese interior.

Later in the same year, Zhang decided to declare his allegiance to the Nationalist government in Nanjing under Chiang Kai-shek, and consequently, China was nominally reunified under one government.

Nanjing is also considered a Beta (global second-tier) city classification, together with Chongqing, Hangzhou and Tianjin by the Globalization and World Cities Research Network, and ranked as one of the world's top 100 cities in the Global Financial Centres Index.

Nanjing served as the capital of Eastern Wu (229–280), one of the three major states in the Three Kingdoms period; the Eastern Jin and each of the Southern dynasties (Liu Song, Southern Qi, Liang and Chen), which successively ruled southern China from 317 to 589; the Southern Tang (937–75), one of the Ten Kingdoms; the Ming dynasty when, for the first time, all of China was ruled from the city (1368–1421); and the Republic of China under the nationalist Kuomintang (1927–37, 1946–49) prior to its flight to Taiwan by Chiang Kai-Shek during the Chinese Civil War.

On October 10, 1911, Sun Yat-sen's followers launched the Wuchang Uprising, which led to the collapse of the Qing state and 2,000 years of dynastic rule, as well as the establishment of the Republic of China.

The split was partially motivated by the purge of the Communists within the party, which marked the end of the First United Front, and Chiang Kai-shek briefly stepped down as the commander of the National Revolutionary Army.

In 1936, when natural disaster struck Central China with widespread flooding affecting Hebei, Hunan, Jiangxi, Wuhan and Chongqing caused by the Yangtze and Huai Rivers bursting their banks, Ong Seok Kim, as Chairman of the Sitiawan Fundraising and Disaster Relief Committee, raised money and materials in support of the victims.

Japan, which aimed to dominate Asia and the Pacific, was at war with the Republic of China by 1937.

Generalissimo Chiang Kai-shek deployed his best army to defend Shanghai, but after three months of fighting, Shanghai fell.

Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve; instead, the Chinese government relocated inland to Chongqing and continued the war.

Founded by the state of Shu prior to its incorporation into China, Chengdu is unique as a major Chinese settlement that has maintained its name mostly unchanged throughout the imperial, republican, and communist eras.

During World War II, the capital city of China was forced to move inland from Nanjing to Wuhan in 1937 and from Wuhan to Chengdu, then from Chengdu to Chongqing in 1938, as the Kuomintang (KMT) government under Generalissimo Chiang Kai-shek ultimately retreated to Sichuan to escape from the invading Japanese forces.