I'm not sure if you mean nadir or not but nadir is the term used to describe the race relations between blacks and whites in between Reconstruction and the Civil Rights Movement.

William Oscar Brown has written:

'Race relations in the American South and in South Africa' -- subject(s): Race relations

Gretchen Murphy has written:

'Shadowing the white man's burden' -- subject(s): Race relations, History and criticism, Racism in literature, Race in literature, Imperialism in literature, American fiction, Foreign relations, History

'Shadowing the white man's burden' -- subject(s): Race relations, History and criticism, Racism in literature, Race in literature, Imperialism in literature, American fiction, Foreign relations, History

Dan Martin has written:

'A road to reconciliation' -- subject(s): African American Baptists, Baptists, Biography, Clergy, Race relations, Religious aspects of Race relations

William A. Osborne has written:

'The race problem in the Catholic Church in the United States' -- subject(s): African American Catholics, Catholic Church, Race relations, Religious aspects, Religious aspects of Race relations