The Communist Party of China is the political party that governs the People's Republic of China. With more than 89,000,000 members in 2017, it has become one of the largest political organizations in the world.
After its foundation in 1921, the Communist Party of China became one of the most influential political formations in China. In 1949, the party's army, called the People's Liberation Army, defeated the Kuomintang (KMT) nationalists in the Chinese Civil War.
The leader of the Communist Party of China at that time, Mao Zedong, proclaimed the new People's Republic of China, under the leadership of the Communist Party.
Answer:
China became a communist nation in 1949