Many people in the alternative history community believe that until recently there was a unified civilization and that it was called "Tartaria". The idea of calling this civilization "Tartaria" is spread mainly on Reddit and Youtube, and promoted by Youtubers who make their money by building an almost religious following.

I think anyone who uses the term Tartaria to describe the Old World continues to cement a misleading view of alternative history.

The myth arose when Russians began to realize that their land was called "Tartaria" on ancient maps before it was called Russia. And it extended not only over Russia, but over most of Asia.

Tartaria was divided into different parts - Russian (Muscovite) Tartaria, Chinese Tartaria, etc. It was not a worldwide advanced civilization that somehow dominated all other kingdoms we see on ancient maps. Tribute @benshresearch

What is the meaning of Tartary and what is the myth about it ?

Tartary (English) = Тартария (Slavic).
Bulgarian: Територия (Teritoria) = territory (English). "Grande Tartary" = large territory.
Russian: Tерритория (Territoria) = Territory (English).
Serbian: Tериторија (Teritoridja).
Polish: Terytorium
Romanian: Teritoriu
Portugal: Territory
Latin: territory

And what does it turn out to be? Tartary/Tartaria simply means "territory". Territory that has no name for the people who made the maps.
Tribute @benshresearch

Later, some people found evidence that there were remnants of Tartaria in the Americas, mainly also in Western America. So the idea spread that Tartaria was literally everywhere.

And this is where things began to move in the wrong direction. In reality, Tartaria was not a geographical area, but a kind of kingdom with a flag and political entity, with some of these Tartarians also influencing American culture.

That's all there is to it. It was part of the "Old World," but it was not exclusively Old World.

Using the term Tartaria every time you talk about this Old World cements a misleading view of a Slavic-centered world where, for some reason, Russian culture supposedly dominated everything else. Tribute @benshresearch