Race is the construct ethnicity is physical. Race is basically the loose and flimsy way to over generalize ethnicity.

It’s basically like the difference between gender and sex.

One is based on the cultures perceptived notions of a group of people based on only physical characteristics.

The other is based on the hard facts such as history or biology.

It’s easy to change ones race, just go to a different part of the world with a different view of what the races are. It’s impossible to change ones ethnicity as you can’t change who your parents are or where you grew up.

This gets into the nerdy weeds and generally the avg layman just thinks fo the two terms as the same thing. Which is where most of the problems come from