Which ethnic group is most widespread in the western europe?

The most widespread ethnic group in Western Europe is the Caucasian.

Explanation:

The term Caucasian refers to an individual of white race. Classical anthropology defined a population as Caucasian if it had certain characteristics such as variations in the shape, size and color of the eyes (blue, green, honey, and chestnut) and in the coloration of the hair (blond, ginger or various brownish colorations). Whites would also share other features such as more body or facial hair than other races.

White was previously used in a very broad term for people who were characterized by, among other things, light pigment in the skin and lighter hair and eye color. The term that later changed to Caucasoids is now obsolete, as the division into people based on external characteristics does not correspond to recent research. However, the term "white" is still used today in demographic contexts.

Low pigmentation leads to the formation of more vitamin D in the skin, but protects poorly from sunburn, and is best suited for areas with low sunlight.