Why the western people have coloured hairs ?

From the science fact,people have different colour of skin,eye and hair because their amount of melanine.Maybe you can see many of asian have a brown hair or eye.It is because they have small melanine in their hair or eye.Sometime,other western also have black hair,eye and also dark skin even they are in cold countries.This is because of the melanine.If we have more melanine,our hair or eye will become black.Maybe you can make a research on it to know it more deeply.Thank you and have a nice day.

If you are talking about natural hair colour, blonde or light coloured hair is part of the northern genetic adaption of low melanin which allows us to make the most of what little sunlight penetrates the foggy north. That said, there are plenty of black haired Europeans..