On whiteness

Speaking of white culture, who is included in the seemingly unprecise term "white"? All of Europe? The western parts of Asia?

Within Europe many people are not considered white by other Europeans. Especially Greeks, but also Spaniards, would often not be referred to as "white".

Discuss this in particular or race in general.

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Turks predominantly aren't white (Only 10% or something(pulling figures from my arse)).
Slavs are white.

Very true, "pure" is very hard to find. White skin I guess is the only testament to being white in such regions (or at least a paler completion).