". . . [I]t must be admitted that American Negroes have been a race more in name than in fact, or to be exact, more in sentiment than in experience. The chief bond between them has been that of a common condition rather than a common consciousness; a problem in common rather than a life in common. In Harlem, Negro life is seizing upon its first chances for group expression and self-determination. It is— or promises at least to be— a race capital. That is why our comparison is taken with those nascent centers of folk-expression and self-determination which are playing a creative part in the world to-day."-Source: Alain Locke, "The New Negro," 1925The excerpt best serves as evidence for which of the following developments?

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