It'd be regions/land-based, probably. "Southern pride," etc...just without the racism. Fuck those star-bellied sneeches across the river.

I vote we use wealth.

Having lived in a majority white city where they divided themselves between countries of origin, this would happen.

Until a large Hispanic influx northeast PA had Italian sections, Irish sections, Lithuanian sections, Polish sections, etc. When my ex’s grandmother met me she asked me “what are you?” despite us both being white.

Or people would simply be divided over what race they used to be.

And people would also track down and document what race people used to be before the change happened so that they could keep on hating too.

Exactly. This is why people say race is a construct.

If we all became the same race then some self labeled ingroup would construct (i.e. create) new criteria to label others as an outgroup eventually creating new races.

Exactly.

https://www.youtube.com/watch?v=oIcsk2ZoaTY&t=17