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.

>>2
What about turks? Serbs? Croats? Other ethnic groups of the balkans, like macedonians? Poles? The fins, the lapps and the hungarians? South italians? Russians?
Personally i highly doubt that there has ever been anything remotely like a "pure" spaniard or greek since the areas in question has been locis for intense warfare, far sea trading and overall geographical exploration for millenia. Choosing what type of ethnic features are to be pure or non-pure is completely arbitrary.