Race is a difficult thing to classify (I realize scientists in the late 19th century did attempt, or claim, to do so). Race is more or an idea, a typology, than a fact. The few external factors that we can point to as somehow being indicative of race are so minor and so unstable as to be insignificant.
It might be more accurate to use the analogy of breed (as in animals), and then still most of us would not have a clear pedigree.
There are no hard edges in ‘race’, they all blend into each other seamlessly.
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