How do the concepts of "biracial" and "multiracial" relate to w.
e.
b. du bois notion of "color line"?

Biracial means that a person has two racial backgrounds. While multiracial, means that a person has multiple racial backgrounds. In the past, being called such has become a derogatory term years back as it connotes discrimination and insult, however, now, it is more accepted and even celebrated.

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