Nickpicking: the CCP foundational congress was held on 23 July 1921, making it 100 years old in a couple of month. The Red Army was founded on 15 July 1927, which is why it is generally assumed (seriously or not, I don't know) that China aims at reuniting with Taiwan before 2027.

But the CCP has been controlling mainland China for a little bit over 70 years, indeed.

to be even more correct, china isn't one culture or one ethnicity. it covers a huge area, and especially before modern times, it was composed of a lot of different cultures and ethnicities, with a shitload of different languages and customs. CCP and other earlier powers (Emperors?) just brought them all, or large chunks, under a common flag.

Most importantly, a common writing system, common to a huge area. One that mathematicians successfully took inspiration from and repeated the success of universality at an even greater scale.

Think bigger. There is cultural knowledge going back further than any particular political or economic system. China has seen those come and go within its own borders, too.