From what ive observed (no real research just educated guessing) i understand that dialects change and evolve over time but when does a language become so different from its origin that 2 people whose languages derived from the same root cant communicate with each other?
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When communication stops being a factor, essentially.
The linguistic drift that would become several of the romance languages pre-dates the fall of fhe western Roman Empire, but it wasn’t until there wasn’t until the bureaucracy collapsed, trade and travel had to be dialed way the hell back because everyone needed to focus on their own survival that new slang stopped propagating as far and there wasn’t really any practical reason to keep up with people hundreds of kilometers away’s slang and culture, but there’s a bunch of communication with the villages a day’s travel by horse so you all develop the same kind of slang and in jokes.
Similarly, if we were somehow sent back to the iron age, in less than 100 years the people in los Angeles would be speaking an entirely different language than the people in New York would be speaking a different language from the people in England
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