This is an excellent introduction to Black Liberation Theology by Anthony Bradley. Bradley is a research fellow at the Acton Institute, and assistant professor of apologetics and systematic theology at Covenant Theological Seminary in St. Louis. He's an African-American who seems to have firm grasp on the sources of "Black Theology". As I know nothing on the subject, I found it very helpful. Here’s an excerpt:
Barack Obama's former pastor, Jeremiah Wright catapulted black liberation theology onto a national stage, when America discovered Trinity United Church of Christ. Understanding the background of the movement might give better clarity into Wright's recent vitriolic preaching. A clear definition of black theology was first given formulation in 1969 by the National Committee of Black Church Men in the midst of the civil-rights movement:Check out the full article over at the Acton Institute.
Black theology is a theology of black liberation. It seeks to plumb the black condition in the light of God's revelation in Jesus Christ, so that the black community can see that the gospel is commensurate with the achievements of black humanity. Black theology is a theology of 'blackness.' It is the affirmation of black humanity that emancipates black people from White racism, thus providing authentic freedom for both white and black people. It affirms the humanity of white people in that it says 'No' to the encroachment of white oppression.
In the 1960s, black churches began to focus their attention beyond helping blacks cope with national racial discrimination particularly in urban areas.