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History Dates
Dates
| War duration | 1955-1975 |
| U.S. combat troops deployed | 1965-1973 |
| Truman Doctrine adopts containment as U.S. foreign policy. | 1947 |
| President Dwight D. Eisenhower expresses the Domino Theory in a press conference. | 1954 |
| Diem becomes President of South Vietnam after defeating Bao Dai in a referendum. | 1955 |
| Implementation of Strategic Hamlet Program. | 1961-63 |
| November 1963 | Diem is assassinated in a U.S.-supported coup. |
| 1965-1968 | Operation Rolling Thunder (643,000 tons of bombs on North Vietnam). |
| December 1972 | Operation Linebacker II (20,000 tons of bombs in 12 days). |
| 1968 | Tet Offensive, triggering major public distrust and anti-war sentiment. |
| 1970 | Kent State shootings (4 killed, 9 wounded during protests). |