Hola Ana Laura! I have always found this issue to be really interesting because of the huge variety of languages in the world, so I would like to recommend a book for anyone interested in the idea of identity related to language. It is called "The Poetics of Relation" by Édouard Glissant, a poet/philosopher from the Antilles. Although the book is focused on one's cultural identity in relation to territory and contact with other cultures, he has an interesting section on language that might be interesting for this debate.
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