Reference 1: All immigrants from Sub-Saharan Africa, Nigeria, Ethiopia, Ghana, Kenya, Somalia, Democratic Republic of Congo, Cameroon, Liberia, South Africa, Eritrea, Sierra Leone, Togo, Côte d'Ivoire, Uganda, Guinea, Senegal, Cape Verde, Gambia and Rest*.
Reference 2: 2013, 2011, 2009, 2007, 2005, 2003, 2001 and 1999.
Source: http://en.wikipedia.org/wiki/Racial_and_ethnic_demographics_of_the_United_States
Reference 2: 2013, 2011, 2009, 2007, 2005, 2003, 2001 and 1999.
Source: http://en.wikipedia.org/wiki/Racial_and_ethnic_demographics_of_the_United_States
