Question

The two Chinese groups that fought one another before the invasion of Manchuria were the

Answer 1

KMT - Kuo Mintang government forces
CPC - Communist Party of China

Answer 2

The two Chinese groups that fought one another before the invasion of Manchuria were the KMT and CPC.

KMT refers to Kuo Mintang government forces and  CPC refers to Communist Party of China.

The Kuomintang of China, KMT is a very important political party in the Republic of China on Taiwan, based in Taipei, founded in 1911, and is currently an opposition political party in the Legislative Yuan.

The Communist Party of China (CPC), is the founding and ruling political party of the People's Republic of China.