This is interesting because the projected growth for single-race black population of the United States for July, 2050 is only an increase of 1.2 %. That would mean that over a time frame of 44 years, we would only expect the black population to increase by 21.2 million individuals (61.4 million total by 2050). Blacks would only constitute 14.6% of the nation's total population making them a constant minority group.
As of 2010, the approximate percentage is 12.6%, not exactly on coarse for a growth in 1.2% as projected. In fact, it's declining. Link to Census