The flow from Africa began in the 1970 's , mostly with refugees from Ethiopia and Somalia , and escalated in the 1990 's , when the number of black residents of the United States born in sub-Saharan Africa nearly tripled .
Africa /location/location/contains Ethiopia
Africa /location/location/contains Somalia
DT NN IN NNP VBD IN DT CD POS , RB IN NNS IN NNP CC NNP , CC VBD IN DT CD POS , WRB DT NN IN JJ NNS IN DT NNP NNPS VBN IN NNP NNP RB VBD .
Africa
LOCATION
Ethiopia
LOCATION
/location/location/contains
Africa
LOCATION
Somalia
LOCATION
/location/location/contains