Research Papers / need help for early Black-White interracial [3]

hi, is there anyone could help me with my research paper about Black-White Interracial.

Actually, My teacher thought this topic is too general. He ask me to forcus on something about Black-White Interracial, and give him an thesis question and answer with three supports about it.

I think my teacher prefer the topic about early age, because he recommended a book about northern free blacks, 1700-1860.

Could you please give me any ideas about it?

Thank you