Why did China become communists?

People's Republic of China became a communist nation because of its previous weak democratic government. Chinese government wanted to control the country by itself without having others to interfere. The communist government wanted China to become a strong nation and not to become under control by other countries (Ex: Great Britain and Japan used to control China). The communists were came from Soviet Union, they might believed that Soviet Union became a strong nation b/c of its communism policy.