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In the last two decades the comparative analysis of race relations in the U.S.A. and Brazil has been based on a conventional wisdom. It is the corollary of a larger conventional wisdom in the study of comparative race relations. The thesis is that systems of race relations in the Western Hemisphere are primarily of two types: bi-racial and multi-racial. The distinction is normally spelled out as follows. The U.S.A. is a prime example of a bi-racial system. In the prevailing logic of the US legal and social structure, individuals have historically been either black or white. In Brazil, on the other hand, there has been a spectrum of racial distinctions. At a minimum, Brazilian social practice has recognised white, black and mulatto. At a maximum, the phenotypical distinctions have become so refined as to defy analysis, or effective application for those who would discriminate.
Thomas E. Skidmore (Sat,) studied this question.