Why does Tina Knowles identify as Black despite her ambiguous appearance?

Why does Tina Knowles identify as Black despite her ambiguous appearance?
she's always in interviews doing the most always whining about racism yet she could have easily passed herself off as a different nationality. thats one thing i noticed about the Americans that the most ambiguous looking AAs are often militant
Why does Tina Knowles identify as Black despite her ambiguous appearance?
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