There’s a reason why the Chinese civilization has existed over 3,000 years.
Meanwhile western cultures come and go.
not saying I disagree.... but what reason are you implying?
derrr... nevermind... border protection. I spoke (typed) too soon.
Well the Mongols conquered China and ruled it for about a hundred years.
The Manchus (Jurchens) conquered China and ruled it for some 300 years, until the Chinese empire fell in 1910.