The continued existence of the Basque language (Euskara) is primarily due to a combination of factors, including:
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Geographical Separation: The Basque Country is characterized by its mountainous terrain and has historically been relatively isolated from neighboring regions, which has helped preserve its linguistic uniqueness.
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Cultural Identity: The Basque people have a strong sense of cultural identity, and the Basque language is a crucial part of that identity. This cultural pride motivates many to learn and use the language, even in the face of dominant neighboring languages like Spanish and French.
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Promotion and Protection: In recent decades, there has been significant institutional support for the Basque language, including government policies that promote its use in education, media, and public life. This has included language revival efforts and the establishment of Basque-language schools (Ikastolak).
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Community Efforts: There is a vibrant community of speakers and advocates who actively work to promote and preserve the language through cultural events, literature, and social initiatives.
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Historic Recognition: The Basque language has been recognized as a historic language with linguistic significance, which has led to efforts to safeguard it as part of the region's cultural heritage.
While the reasons you provided don't perfectly apply (such as refusing to learn other languages or outlawing others), the Basque language has indeed thrived partly due to geographical isolation, cultural identity, and institutional efforts to protect and promote it.