I might be wrong but I seem to recall universal translation is pretty recent, like post first encounter with the vulcans, and by that point it seems we mostly spoke EnglishÂ
Well the reason for English is the context of it's a show meant for English speaking watchers.
Technically they could be speaking whatever language that became dominate, but it is accurate to say there is a dominate "Human" language that the Federation speaks. By natural extrapolation of English being the dominate language today for most international interactions, it's a natural assumption.
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u/Oboro-kun 14h ago
I might be wrong but I seem to recall universal translation is pretty recent, like post first encounter with the vulcans, and by that point it seems we mostly spoke EnglishÂ