I had red hair (at least when I was a kid). Now it's just mostly grey. Ah, the hazards of growing old.
There seems to be a genetic relationship between Northern European ancestry/genetics, and red hair. Not to be racist, but you don't see many italians or greek or chinese people with red hair? Note that there is also a known genetic relationship between Northern European ancestry and susceptiblity to T1 diabetes.
Where I grew up in the Midwest, it was pretty much a given that you had German or Scandanivian or maybe Eastern European ancestors. That was a long time ago now but the melting pot wasn't , and still isn't, equally poured across the U.S.