Second Sino-Japanese War
The origin of the second sino-japan war can be traced by the first sino-japanes war of 1894-95.
The Republic of China
However centeral authority disintegrated and the republic's athority succumbed to that of regional warlords.
In 1915 japan issued the twenty-one demands to exort further political and commercial privilege from China.
The Kuomintang swept through china untile it was checked in shandong.
Nominal Unification of China
In the same year, Zhang Zuolin assassinated when he became less whiling to cooperate with Japan.
Communist Party of China
In 1930, large scale civil war broke out between warlords who had fought in alliance with the Kuomintang during the Northern expedition and the central government under Chiang.
Invasion of Manchuria, interventions in China
The chaotic situational in china provided excellent opportunities for the japanese expansionism.