Answer:
The Nationalist movement included many Communists as part of the Sun Yat Sen's revolution in 1911. The Republican Government was in charge in Beijing but China is a very large and fractious place. The Republic inherited a very bad Foreign Affairs situation. The "unequal treaties" left the Central Government tied to many bad deals with Foreign Governments. The Japanese were claiming a larger and larger area of China for themselves.
Step-by-step explanation: