There's one species of humans still around. Race is a non-scientific category that got made up a few centuries ago, and has continually changed over that time.

There's one species of humans still around. Race is a non-scientific category that got made up a few centuries ago, and has continually changed over that time. Ethnicity is the regional and cultural group of usually related people that everyone prior to western colonization understood as separate groups. Often you could assimilate into a different ethnicity. So Romans would have understand themselves to be different from Greeks, Persians, Egyptians and Jews.