In that respect, it was racism and social exclusion that isolated African-American musicians of those eras and led to the evolution of different music. In principle, African-American music of the early 20th century evolved in the same way as Darwin's famous finches of the Galapagos Islands: community isolation. Substantially because of the effects on African-American soldiers of returning to a segregated society after their combat experiences during Word War II, racial pride popularized expressions of unity and terminology of self-elevation such as the use of "Man" among and between African-Americans. It is likely that this intensified and grew tremendously in common usage by the onset of the Civil Rights Era of American 20th Century History. In principle, African-Americans probably used "Man" as a specific way of rejecting and putting to rest the long-used pejorative "Boy" used for generations to subjugate African-American males regardless of their chronological age or their relative chronological age to any white person. Thereafter, it lost its original connotation but remaining within the vernacular as well as spreading widely to much more general usage among non-African-Americans as well.

Contemporary Thoughts on the General Phenomenon of Black Baptist Churches

Clearly, the institution of the Southern Baptist Church also played a significant role in the development and spread of many aspects of African-American...

On a superficial level, that is no less understandable than the influence of southern accents and dialects on African-Americans. However, on a deeper level, it is curious, to say the least, that once freed, the southern blacks would have adhered so closely to the religion of their captors. In that regard, contemporary African-Americans are predominantly Southern Baptist simply because that was the religious denomination of almost all of their "owners" prior to the abolition of slavery.
To at least some observers, it seems antithetical that any people would adhere so closely to the religion preached by those who exploited them so horrifically for generations, ultimately even dying en mass in a last-ditch effort to preserve the inhuman and fundamentally immoral institution of slavery. One might expect the freed slaves to reject the same religion that was unable to provide sufficient moral guidance to condemn slavery. One might also have expected greater interest and enthusiasm for reconnecting with the African religious traditions that were stripped away from the African people thrown into slavery. Finally, it is ironic that contemporary African-Americans would be predominantly Christian given the fundamental role that Christianity actually played in helping the European (and Colonial) expeditions justify and excuse their abuse of fellow human beings predicated specifically on the presumed superiority of "civilized Christians."