Columbia subject headings:
Africa--Commerce--United States.
Africa--Economic policy.
Investments, American--Africa.
United States--Commerce--Africa.
Harvard subject headings:
Africa--Commerce--United States.
Africa--Economic policy.
Investments, American--Africa.
United States--Commerce--Africa.
Princeton subject headings:
Africa--Commerce--United States.
Africa--Economic policy.
Investments, American--Africa.
United States--Commerce--Africa.