I'm not sure if I can correct your ignorance here, but let's go.
Taiwan calls itself "The Republic of China".
They speak Mandarin
They write in Hanzi (which would be traditional Chinese characters).
They are ethnically Han Chinese. (97% Han Chinese compared to the mainland, which is a mere 91% Han Chinese)
The entire UN realized that Beijing was the legitimate government of China, controlling most of the territory and population. That's why they voted in 1971 to take the UN seat away from Taiwan and give it to Beijing, and frankly, it never should have taken that long. Only the US kept Taiwan on the Security Council, even though it wasn't even a minor power.
The Communists did not win the civil war because of "Russia"; they won it because Chiang Kai-Shek was a corrupt little stooge of the West who let the Japanese overrun half the country. Even his allies thought he was kind of worthless, referring to him by nicknames like "Peanut" and "Cash My Check". The west was perfectly willing to let Mao have Taiwan, too, until the Korean War broke out and we found it useful to maintain the "Republic of China" fiction.
China is succeeding because of the drive, work ethic, and genius of the Chinese people. China was in fact, the world's largest economy until 1750, when it was overtaken by the British Empire, and then the US. Only a matter of time before it is again.