I encourage you to, Dawn.
HUMANS! I love the human race... and the human condition... Why must we classify ourselves any further?
~Melanie

Great answer, Melanie! I am using it too! I always hate that question on a form.
However, I was pondering the same thing about the allergy. It occurred to me when I read of the lawyer in Massachusetts who died of PA, and noticed he was "black" for lack of knowing really if he were African-American, Nigerian, Hatian, or whatever! It just occured to me that those of us I have seen, or met, and in our lives with food allergies have been "caucasian" or "Asian."
Just got me wondering about the allergies and races or more specifically ethnic groupings.
However, so many factors come into play, as others have brought up. There is regional diets, general complexions, and if a community is made up of a large group of people who share some features and complexion, naturally those things reproduce, as could the allergies. Seems too hard to narrow.
I have always thought of skin color as developing based primarily on climate factors, and simply being a "survival of the fittest" type of genetic trait that becomes stronger over time. It clearly does not take much to change skin color, so it just cannot be that major a difference. Just the most obvious difference at times.
After considering all these things you all bring up, I would wonder more about a combination of factors, like general region and climate, regional cuisine, ethnicity, yes, since it affect food and feeding to a great extent(how long cultures breastfeed).
Alot to ponder, and seems food allergies are influenced not only by genes, but by culture(feeding what and when). Tough to differentiate between the nature and nurture facts. becca

I'm inclined, personally, to think that PA, like other food allergies, and the increase in incidence of it has to do mostly with diet and the fact that peanuts and processed peanuts are in sooooo many things they weren't in 50 years ago.
I never would have thought about how much peanut things I consumed or used prior to my sons diagnosis, and it was a devastating time trying to eliminate them, as I have always been a peanut addict.
For example, I am allergic to poison ivy and always have been. Brutally, nastily, grotequely allergic. I was always told as a child you either were or were not allergic to poison ivy and couldn't develop the allergy later in life. New research has found that continued exposure to poison ivy in a non-allergic person will eventually lower their immuno response and eventually they are likely to get it.
My husband, who was so immune to poison ivy as a child and a teenager, would pluck it, rub it on himself, walk right thought it, etc. Never got it. He moved away from the area for 8 years, worked as a landscaper in an area that doesn't have it. When he moved back here, he did some yard work for my father and low and behold, he was soon covered in poison ivy. Mild reaction, compared to mine (I stupidly did his laundry and got it all over!), but the doctors said it will only get worse if he exposes himself again. Change of field... new job!
I ate peanuts all my life. As a vegetarian, it was practically my sole source of protein. During both pregnancies I craved peanuts and couldn't keep down much else.
When my son was dx'd PA and I had to start looking through everything, I discovered in short order than nearly 80% of everything I had in my house had something with peanuts in it. Peanut oil, peanut butter, peanuts in detergent, lotions, etc. I broke down and cried.
I don't miss them anymore... well, that's not entirely true, but I can only say that if everyone's house out there was like mine, it's no wonder kids are developing allergies!
~Melanie