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So a young nomadic Mongolian girl and I (UK, middle-age, male, working in craft/retail) don't represent different cultures because we can both speak EnglishIf the Mongolian girl lives in Englang and speaks English as a first language (e.g. second generation immigrant), then obviously she is far less different culturally to you than a Mongolian girl that just arrived from Ulan Bator.
Cultures have degrees. Losing the language of your culture means you lose a lot of connection to it (can't anymore follow its arts and letters for one, or even casual conversations between people from that culture).
And after a few generations in a different country you're mostly a token X (where X your original culture), except if you (and your family) went to great pains to maintain the connection (the default is losing it).
>Didn't you already explain that there were vastly different subcultures within the population of English language speakers?
Vastly different cultures in arts/consumerism/urban lifestyle/etc, but not vastly different national cultures.
A 3rd-gen British Mongolian can be a spiky haired punk, something totally different from a 3rd-gen British Italian dubstep fan, but they're both hardly major representatives of Mongolian and Italian cultures.
>Don't you think there's more to culture than mutual unintelligibility?
Given that all culture is made into some language or another, and more especially in some national cultural context or another, then, yes, there is something more, but not much.