From 1950 to 1973, US Presidents increasingly escalated American involvement in conflicts in Vietnam:
- Although Ho Chi Minh had been a US ally during WWII, Harry Truman supplied France with military and economic aid to support its war to reconquer Vietnam. In September 1950 Truman sent the first US military advisors to Vietnam.
- Dwight Eisenhower increased aid to France and in 1954, he actually considered bombing Vietnam to prevent a French defeat in the war. But he conditioned US military intervention on support from Britain, and Prime Minister Winston Churchill refused to get involved in France's doomed colonial war. Eisenhower declined to intervene militarily, but he nevertheless ignored the Geneva Accords and supported the permanent division of Vietnam into North and South. In the South, Eisenhower installed a corrupt and authoritarian government led by President Ngo Dinh Diem. In 1956 the US suffered its first causality in Vietnam, and the following year Eisenhower sent the first Special Forces troops to Vietnam. However, advisors and Special Forces were not combat troops and they were not sent to engage in offensive operations.
- John Kennedy dramatically increased the number of US advisors from 900 to over 16,000. He authorized the Strategic Hamlet Program and ordered Operation Ranch Hand, which saw the Air Force use herbicides to defoliate the Vietnamese jungles. Although in October 1963 JFK signed NSAM 263, which withdrew 1,000 US advisors as part of a broader plan to withdraw all advisors by the end of 1965, later that same month Kennedy greenlit a military coup against Diem. Kennedy did not intend for Diem to die in the coup, and he was horrified when this occurred, but the coup should never have happened in the first place. The coup badly destabilized the situation in Vietnam, leaving the next President with the difficult decision of either withdrawing from Vietnam or escalating further.
- Lyndon Johnson did not follow through on the Kennedy-era plan to withdraw US advisors and he continued sending them through 1964. In August 1964 LBJ misrepresented the Gulf of Tonkin Incident by telling Congress that two attacks on US naval vessels had occurred, when in reality only one occurred. Johnson lied to Congress to convince them to pass the Gulf of Tonkin Incident, which was basically a blank check for war. Following the Gulf of Tonkin Incident LBJ ordered the first bombing campaign against Vietnam. After promising the American people in October 1964 that he would not send American troops to fight in Vietnam, in March 1965 LBJ commenced Operation Rolling Thunder and sent the first combat troops to Da Nang. (Ironically, that is the same place where the first French troops landed in Vietnam in 1858). LBJ had been told by his generals that "victory" in Vietnam would be a stalemate that would require 4-5 years of fighting, but LBJ consistently misrepresented the war to Congress and the American people by suggesting that "light" was at the end of the tunnel. Ultimately, the Tet Offensive exposed the government's lies about the war and LBJ dropped out of the 1968 election due to voter backlash against the war.
- Richard Nixon illegally sabotaged the 1968 Paris Peace Talks in order to win that year's presidential election. After he won, he needlessly prolonged the war for four years so that he could be re-elected in 1972. After his re-election he accepted the same peace deal which had been offered by North Vietnam in 1969. By 1973, Nixon had invaded Cambodia and ruthlessly carpet bombed Indochina. Tens of thousands of Americans and countless people in Vietnam, Laos, and Cambodia died as a result of Nixon's chicanery and venal pursuit of power. The last combat troops were withdrawn by Nixon in 1973.
- Technically there were still 50 US military personnel in Vietnam by 1975, but they were not combat troops and they left following the fall of Saigon.