Which african american was the first black person to get a doctorate from harvard university?

W.E.B. Dubois was the first black person to get a doctorate from Harvard University.

Explanation:

When he entered many Universities to pursue advanced studies he was confronted with discrimination that continued based on ethnicity and race in colleges and schools. This influenced him to work for the benefit of the Africans.

He pursued a writing career which made Du Bois to enthusiastically support the African American community. His books echoed his solid support towards the people of Africa. His writings were widespread and respected by the Africans all over the world.  

He founded an establishment which worked diligently for the development of the colored people.

they supported black codes so the answer is a or b