The Communist Chinese forces were able to defeat the Guomindang because ?

they were more motivated

Explanation:

PLA officers treated ordinary soldiers with more respect than the soldiers got in Chiang’s armies. PLA soldiers were also more motivated than Chiang’s troops. During the civil war, hundreds of thousands of individual Nationalist soldiers deserted, surrendered, or defected to the Communists. (hope this helps)

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries