England, in relation to the diaspora, is a major actor. There's research and scholarship that illustrates the presence of peoples of African origin and decent during the time of Roman, and pre-Roman, Britain. Black history in Britain both correlates to, and deviates from, that of the United States. On the one hand there are a number of experiences held by Blacks in Britain that are parallel to those of Blacks in the U.S., such as the slave trade, pan-Africanism, and a long and exhaustive fight for civil rights. One thing that it holds that is comparatively unique to it, however, is the immense amount of historical content-- Seeing as how the U.S. is a product of England and was established far after.