Tupí is just the name given by the first european explorers in the atlantic side because of one tribe, the Tupinamba (could have been Potiguara, Tobatí, Paranaygua etc)
When we talk about Guaraní, is an umbrella terminology to aply to all the “ava ñe’e” speakers with the same cultural, religious and socio-economic way of life
The Guaraní and Tupí speaks almost the same language with insignificant differences, culturally they are the same (with the differences related to tribe to tribe) and share the same history about their origins and why they split from each other
So, if they wanted they could name them “Ava” which is “people” in their language or stick to Guaraní that means “Warrior”
For that matter is that there should be a option to stick to a traiditional forestry way or the Jesuit Missions, that involves gunpowder and have the military Tercio-like organization
Take a look to the post friend Guaraní Civ
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