foreign-born blacks made up 3.1 per cent of the black population in 1980 .
that number has been on rise and they were 8.7 per cent of group in 2013 .
majority of immigrants are from jamaica , haiti , ethiopia and nigeria .
black immigrants more likely to have college degree and have a higher income and are less likely to live in poverty than the us-born population .
foreign-born blacks are now large part of population in nyc , dc and miami .