Roy
The idea that nation-states defined essentially by a shared ethnolinguistic identity are a 19th-century invention is a late 20th century invention. Medieval people explicitly used the Latin word "natio" in the same sense as we use "nation" today.
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In particular, proponents of European-style nationalism like to scoff at America's "propositional nation" as some kind of innovation or ersatz copy of the "real" thing. But it's older than any of theirs!