What's a Caucasian??

From Wikipedia:

"In the United States, it is currently used primarily as a distinction loosely based on skin color alone for a group commonly referred to as Whites, as defined by the American government and Census Bureau... in continental Europe, "Caucasian" currently refers exclusively to people who are from the Caucasus.

"The term itself derives from measurements in craniology from the 19th century, and its name stems from the region of the Caucasus mountains, itself imagined to be the location from which Noah's son Japheth, traditional Biblical ancestor of the Europeans, established his tribe prior to its supposed migration into Europe.

"Caucasoid is a term used in physical anthropology to refer to people falling within a certain range of anthropometric measurements.

"In New Zealand the term Caucasian is used most frequently in police offender descriptions.

"Later anthropologists, including William Z. Ripley in 1899 and Carleton Coon in 1957, further expanded upon the classification of the Caucasian race proposed by Blumenbach, and subdivided the group into Nordic, Alpine, Mediterranean, and at times Dinaric and Baltic subdivisions.

"The term Caucasoid (Caucasian-like) also came into use to encompass a larger grouping of populations with similar skull-shapes, including many North African, South Asian and Middle Eastern peoples. Nordicism, the belief that the blond Nordic sub-division constitutes a "master race", was influential in Northern Europe and the United States during the early twentieth century.

"The question of a difference between the "Caucasian race" and "white" as a racial category in the United States has led to at least one set of major legal contradictions in the United States Supreme Court. In the case of Ozawa v. United States (1922), the court ruled that a law which extended U.S. citizenship only to "whites" did not apply to fair-skinned people from Japan, because:

...The term "white person", as used in [the law], and in all the earlier naturalization laws, beginning in 1790, applies to such
persons as were known in this country as "white," in the racial sense, when it was first adopted, and is confined to persons of the Caucasian Race... A Japanese, born in Japan, being clearly not a Caucasian, cannot be made a citizen of the United States.

"However a year later, the same court was faced with the trial of United States v. Bhagat Singh Thind (1923), where they ruled that someone from the Indian subcontinent could not become a naturalized United States citizen, because they were not "white". The Supreme Court conceded that anthropologists had classified Indians as "Caucasians", and thus the same race as "whites" as defined in Ozawa, but concluded that "the average man knows perfectly well that there are unmistakable and profound differences", and denied citizenship.

and so on...