The status of "language" is not solely determined by linguistic criteria, but it is also the result of a historical and political development. Romansh came to be a written language, and therefore it is recognized as a language, even though it is very close to the Lombardic alpine dialects. An opposite example is the case of Chinese, whose variations such as Mandarin and Cantonese are often called dialects and not languages, despite their mutual unintelligibility.

Answer this question, if possible (if impossible, reply "unanswerable"): Why might Mandarin and Cantonese not be regarded as dialects?
mutual unintelligibility