Quote from dcvtss:
That faction became Taiwan, which is still a US ally.
Quote from MohdSalleh:
During the cold war, mainland China was also an American ally, culminating in Nixon's historical visit. Mao always perceived the USSR as a greater threat and declassified data shows the USSR actually had far greater military plans for strikes against china than the USA. The result was the formation of a tacit strategic anti-Soviet alliance between China and the United States.
History is full of irony, that is why it is called High-story (hi-story).