I'm not someone who tries to claim race is not real. But I do believe sub-categories are becoming more and more difficult to identify precisely. For example, many traditional sub-categories (e.g. Alpine, Nordic, Mediterranean, etc.) seem to be merging in such a way as to blur the lines of delineation. This may be due to higher mobility and interaction throughout the world.

Add to that the fact that peoples such as Indians and many Latinos and Native Americans, though quite dark in many instances, are still physically matched enough (i.e. skeletally, physiologically, etc.) to be classified as Caucasian (i.e. not Mongoloid or Ne9roid).

So, I ask, what is the "Litmus test" of delineation (if any) between Caucasian breeds?