What is the main conflict in The Black Atlantic: Modernity and Double Consciousness by Paul Gilroy?

Paul Gilroy is a Professor of Social Theory at the London School of Economics. His book, The Black Atlantic, is one of the pioneering works in the study of black diasporas, the spread of African blacks across the Atlantic coastline in the United States, the United Kingdom, the Caribbean, South Africa and many other nations. Gilroy focuses in particular on cultural aspects of black Atlantic identity, looking at the history of African intellectuals and the cultural construction of the idea of blackness. Gilroy is particularly focused on a critique of ethnic nationalism as excessively "essentialist" and as having the deleterious of defect as defining black and European experiences against one another. Instead, the idea of race and blackness in particular is more dynamic, differentiated and hybrid and that cultural and race theorists should look more to diversity within races than at the boundary between them.