I just want to jump in on this to add that "ethnicity" isn't fixed, and the relationship between nation/nation state and ethnicity is often one in which they inform each other: the political/military/legal sovereignty of states is often a determinant of ethnicity as much as the other way around.
I actually highly recommend James C. Scott's "The Art of Not Being Governed" for its exploration of this. It's pretty accessible as far as "heavy" anthropological works go.
The life we have conferred upon these objects confronts us as something hostile and alien.
Formerly Virgin Molotov Cocktail (11/10/2004 - 21/08/2013)