Regime change in Republic of the Congo (Léopoldville) (1961) assassination of Patrice Lumumba , Eisenhower (R) (4) the Vietnam War (1959–1975), Eisenhower (R), Kennedy (D), Johnson (D), Nixon (R); (5) Invasion of the Dominican Republic (1965), Johnson (D); (6) The Contras warfare against Nicaragua (1981–1988), resulting in regime change from the