How are the history of black ethnic struggles in the United States and the history of jazz connected?

Please consider the following issues:

Black culture in a white society during the twentieth century
The role of jazz musicians, both black and white, in advancing integration, fighting for civil rights, and using their music as a voice
Specific examples of musicians, music, and incidents that illustrate your points
How the progress of jazz styles reflects the cultural changes of the century
How the general ethos of dominant culture is evident in the world of jazz
Your own conclusion about the relationship posed in the question