I live in san Jose california. My gym has a lot of asians, whites, and blacks.
Asians: for some reason, the asians in san jose are actually pretty decent sized, bigger than any asians in other cities i've been to. they work out a lot here. they are good sized here but seem to have a low ceiling. can't really get huge. they get to a good size and get stuck there.
Blacks: no legs. I've seen some extremely skinny legs on big ass dudes. very hard trainers.
Whites: Anything in between. A lot of the white guys here are good size. I haven't seen a really huge white dude in a while.
Mexicans: 95% of them look terrible. Year in year out they look the same. Probably don't have time for the proper nutrition and training. I see a lot of guys who have been members at my gym for many years and year in year out they just look soft. I don't know why. Even the skinny guys look very soft. But the biggest dude and most ripped dude at my gym is a Mexican. He's a special case.
Persians and Indians: Man i have no comment. They come in in a big group, lift light dumbells and do a ton of socializing. I haven't seen one of them with a decent physique in a long time.