Japan's Invasion on China 1937
First Sino-Japanese War The origin of the Second Sino-Japanese War can be traced to the First Sino-Japanese War of 1894–-95,
Japan had emerged as a great power through its effective measures of modernization.
The Republic of China was founded in 1912, following the Xinhai Revolution .
In 1915, Japan issued the Twenty-one Demands to extort further political and commercial privledges from China.
The Kuomintang (KMT) National Revolutionary Army (NRA) swept through China until it was checked in Shandong, where Beiyang warlord Zhang Zongchang, backed by the Japanese, attempted to stop the NRA's advance.
In the same year, Zhang Zuolin was assassinated when he became less willing to cooperate with Japan.
In 1930, large-scale civil war broke out between warlord who had fought in alliance with the Kuomintang during the Northern Expedition and the central government under Chiang.
In 1933, the Japanese attacked the Great Wall region