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I want to do a plausibility check and possible effects if the Basque and the Catalan people establish settler colonies in Mexico along with other people from Spain, ending up totally around 80-90% of Mexican and Central American population with around 40% of that population of Basque and another around 40% Catalan. And the rest 20% Italian, French, Spanish, Portuguese, etc. And this population has a proportion of ancestry from assimilated Natives. Culture is a hybrid of European and Native. Language spoken is mostly Basque, Catalan and Spanish but Native languages exist in families with close relationships with the Natives and a Native nobility ancestry, even if mostly European now.

Outside the 80+% of the European population, is a large minority population of Native Americans, Mestizo, African, Arab/Middle Eastern, Indian, etc who are well assimilated. Majority religion is Roman Catholicism. Country stretches from Mexico border to parts of Central America.

How plausible is this nation that runs on this timeline? And what would be the effects on USA, Europe, the Americas as a whole and the World?
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