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As there has been a lot of love for Basque atm, I thought I may as well up the challenge. With zero time restrictions, make a way for the Basque language to be the dominate language in the regions associated with the Vasconic Substratum Theory (https://en.wikipedia.org/wiki/Vasconic_substratum_theory).
Basque doesn't need to be the majority language, just the dominant language. I'll that up to you lot to consider what is dominant. Bonus points for anyone who is able the get Basque to somehow spread to the Caucasian Mountains as that place seems to have just about everything spoken there.
Feel free to have as much or as little detail as possible. If you are interested and can be bothered, feel free to as some linguistics stuff and trees etc.