2009 (UTC)
It would actually be interesting to find an answer to the question of what were the languages spoken by the majority of the population around 1500, say. Part of the area was solidly in the hands of various German states by then, but that is a different matter. In the late middle ages, more or less the same hodge-podge that you mention populated what we nowadays think of as East Germany, i.e., the former territory of the GDR. The Wends & co. were originally the majority population of that area, and there are some Sorbs left there even now.   15:35, 13 October