Earlier quoted context omitted.
You seem to be taking ethnicity pretty serious for a guy who says it should be avoided in serious debate. Ethnicity is entirely arbitrary, that's why it should be avoided. For example, the genetic line of what your calling the clearly Native Americans traces back to Asia. You've arbitrarily decided that their ethnicity is defined at a certain time in their lineage. Ehy aren't they Asians or even Africans? There is cu…
You seem to be taking ethnicity pretty serious for a guy who says it should be avoided in serious debate. I take language and debate serious. For example, the genetic line of what your calling the clearly Native Americans traces back to Asia. You've arbitrarily decided that their ethnicity is defined at a certain time in their lineage. Why aren't they Asians or even Africans? Yes I have arbitrarily decided, based on…
and that you can create subsets and most importantly, union any two ethnicities together to get a subset.
ethnicity does not have that latter property though, so starting from the largest group and subdividing does not work.
"the americas is really big" is actually describing "there are many ethnicities in the americas that cannot be unioned together"
the union rule for ethnicities is that you can union two ethnicities and get an ethnicity only if there's significant overlap in genetics, language, culture, traditions, geography, etc.
there arbitrariness in setting that line, but its not approximately zero, as you've been suggesting, and we can tease that out with sniff tests. You maybe just dont know much about native americans, but you'd never put inuit and maya in the same ethnicity.
seriousness in debate and language would be to take curiosity in why the critiques think that size does matter, rather than asserting that it doesnt.