This is adjacent to your question, but it may interest you regardless.
As access to education in Nicaragua increases, for the first time a number of deaf Nicaraguans are all in the same place (a school for the deaf) at once, and these children immediately began creating a (sign) language. This is historic, as it is the first time we can watch the creation of a new language from the beginning, and many linguists are excited about it!
We can’t know exactly how, when, or why unique languages are made. We can make guesses, and we can look how similar things are happening today.
You can read more [here](https://www.scientificamerican.com/article/in-nicaragua-a-language-i/)
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