You could argue though that printing and schools are part of the human evolution.
Same with Japanese. There are some proudly, stubbornly distinct phrases in Kansai-ben and other regions, but the choice of the Meiji-era government to only teach Standard Tokyo Japanese in schools has had the desired homogenising effect.
Even as recently as the 1940s, there are well-documented cases of teens from the south of England, sent to the north of England, to work in mines for the war effort, who simply could not understand the variety of English being spoken around them. Radio and TV smoothed out all those differences.
Fun bit of alt-history pondering - China was the most powerful single nation on Earth at the time of the dawn of the industrial revolution - it's quite plausible that they missed out on that lead just because of a couple of shallow whitewater sections of the Yangtze river that made bringing their coal by barge to the coastal cities impractical.
There was a Chinese industrial revolution in, IIRC, the 1100s and/or 1200s. They were producing something on the order of 100,000 tons of iron a year, with the whole industrial revolution "using the outputs to improve the efficiency" cycle starting to happen.
And then the bureaucrats shut it down, because "the wrong kind of people" were getting rich from it.
They could have owned the world. They could have been the ones with the technological and manufacturing dominance. And instead they threw it away to keep their society stratified in the way they thought it should be. The Chinese "century of humiliation" was caused by that decision back in the 1200s.