Since what era has the US government promoted birth control techniques? A.
prior to 1914
B.
between 1315 to 1317
C.
after 1914
D.
after 1820

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.

C; skin, is the answer!