Once it became better known that the US was providing arms to the FNLA and that UNITA's military successes in the south were largely due to the SADF, international and domestic opinion increasingly sided with the MPLA, and South Africa was soon pressured to leave Angola.  War-weary from Vietnam and wary of new Third World conflicts, a new Democratic Congress in Washington moved to ban military aid to the FNLA.  The departure of the South Africans and American aid, together with infighting between UNITA and the FNLA led to the MPLA taking decisive control of the country in 1976.  Though the FNLA ceased to be a major political force, UNITA continued to actively oppose MPLA-rule for another twenty-six years.  The violence from 1974-1976 cost over 100,000 Angolans their lives and drove tens of thousands of Ovimbundu and Bakongo into Zambia and Zaire.