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 Racial classification is based on skulls, whether it is caucasoid or negroid or mongoloid, you are trying to mislead the reader by referring only to caucasoids, I replaced it with race. 

 I have never seen someone classifying African americans as caucasoids, and it would be wrong to classify them as solely negroid; they are predominantly negroid and few of them have a intermediate or caucasoid skulls (by recombination of the caucasoid genes). Therefore your comment about african-americans being cuacasoid is wrong, it is clear that you have never seen an ethipian to say that they are less caucasoid then AA.