An American Amnesia

January 27th, 1973: the United States, South Vietnam, North Vietnam, and the Viet Cong sign the Paris Peace Accords, guaranteeing the right of self-determination to the South Vietnamese people. April 30th, 1975: President Duong Van Minh of South Vietnam announces the nation's unconditional surrender to the North, ending the decade-long conflict and enabling the merger of both countries into the Socialist Republic of Vietnam. What happened in two short years to cause such a dramatic reversal? In