Retreading old ground, discussed in several threads.

In classical anthropology, "Caucasian" was named for the peoples from the Caucasus, who were considered the type for the groups Indo-European, Semitic, and Hamitic. These peoples extend from western Europe into central Asia.
The great English biologist Thomas Huxley attacked the concept.

The term persists in legal terminology, and is frequent in police reports. Last week. a report from the Calgary (western Canada) police described a suspect in a rape case as Caucasian. Other racially descriptive terms used by local police include East Asian, Black,, Native (American Indian), etc.