According to the terms of the Geneva Accords, Vietnam would hold national elections in 1956 to reunify the country. The division at the seventeenth parallel, a temporary separation without cultural precedent, would vanish with the elections. The United States, however, had other ideas. Secretary of State John Foster Dulles did not support the Geneva Accords because he thought they granted too much power to the Communist Party of Vietnam.

Instead, Dulles and President Dwight D. Eisenhower supported the creation of a counter-revolutionary alternative south of the seventeenth parallel. The United States supported this effort at nation-building through a series of multilateral agreements that created the Southeast Asia Treaty Organization (SEATO).

South Vietnam Under Ngo Dinh Diem
Using SEATO for political cover, the Eisenhower administration helped create a new nation from dust in southern Vietnam. In 1955, with the help of massive amounts of American military, political, and economic aid, the Government of the Republic of Vietnam (GVN or South Vietnam) was born. The following year, Ngo Dinh Diem, a staunchly anti-Communist figure from the South, won a dubious election that made him president of the GVN. Almost immediately, Diem claimed that his newly created government was under attack from Communists in the north. Diem argued that the Democratic Republic of Vietnam (DRV or North Vietnam) wanted to take South Vietnam by force. In late 1957, with American military aid, Diem began to counterattack. He used the help of the American Central Intelligence Agency to identify those who sought to bring his government down and arrested thousands. Diem passed a repressive series of acts known as Law 10/59 that made it legal to hold someone in jail if s/he was a suspected Communist without bringing formal charges.

The outcry against Diem's harsh and oppressive actions was immediate. Buddhist monks and nuns were joined by students, business people, intellectuals, and peasants in opposition to the corrupt rule of Ngo Dinh Diem. The more these forces attacked Diem's troops and secret police, the more Diem complained that the Communists were trying to take South Vietnam by force. This was, in Diem's words, "a hostile act of aggression by North Vietnam against peace-loving and democratic South Vietnam."

The Kennedy administration seemed split on how peaceful or democratic the Diem regime really was. Some Kennedy advisers believed Diem had not instituted enough social and economic reforms to remain a viable leader in the nation-building experiment. Others argued that Diem was the "best of a bad lot." As the White House met to decide the future of its Vietnam policy, a change in strategy took place at the highest levels of the Communist Party.

The character of the NLF and its relationship to the Communists in Hanoi has caused considerable debate among scholars, anti-war activists, and policymakers. From the birth of the NLF, government officials in Washington claimed that Hanoi directed the NLF's violent attacks against the Saigon regime. In a series of government "White Papers," Washington insiders denounced the NLF, claiming that it was merely a puppet of Hanoi and that its non-Communist elements were Communist dupes. The NLF, on the other hand, argued that it was autonomous and independent of the Communists in Hanoi and that it was made up mostly of non-Communists. Many anti-war activists supported the NLF's claims. Washington continued to discredit the NLF, however, calling it the "Viet Cong," a derogatory and slang term meaning Vietnamese Communist.

December 1961 White Paper
In 1961, President Kennedy sent a team to Vietnam to report on conditions in the South and to assess future American aid requirements. The report, now known as the "December 1961 White Paper," argued for an increase in military, technical, and economic aid, and the introduction of large-scale American "advisers" to help stabilize the Diem regime and crush the NLF. As Kennedy weighed the merits of these recommendations, some of his other advisers urged the president to withdraw from Vietnam altogether, claiming that it was a "dead-end alley."

Throughout the fall and into the winter of 1964, the Johnson administration debated the correct strategy in Vietnam. The Joint Chiefs of Staff wanted to expand the air war over the DRV quickly to help stabilize the new Saigon regime. The civilians in the Pentagon wanted to apply gradual pressure to the Communist Party with limited and selective bombings. Only Undersecretary of State George Ball dissented, claiming that Johnson's Vietnam policy was too provocative for its limited expected results. In early 1965, the NLF attacked two U.S. army installations in South Vietnam, and as a result, Johnson ordered the sustained bombing missions over the DRV that the Joint Chiefs of Staff had long advocated.

Nixon's secret plan, it turned out, was borrowing from a strategic move from Lyndon Johnson's last year in office. The new president continued a process called "Vietnamization", an awful term that implied that Vietnamese were not fighting and dying in the jungles of Southeast Asia. This strategy brought American troops home while increasing the air war over the DRV and relying more on the ARVN for ground attacks. The Nixon years also saw the expansion of the war into neighboring Laos and Cambodia, violating the international rights of these countries in secret campaigns, as the White House tried desperately to rout out Communist sanctuaries and supply routes. The intense bombing campaigns and intervention in Cambodia in late April 1970 sparked intense campus protests all across America. At Kent State in Ohio, four students were killed by National Guardsmen who were called out to preserve order on campus after days of anti-Nixon protest. Shock waves crossed the nation as students at Jackson State in Mississippi were also shot and killed for political reasons, prompting one mother to cry, "They are killing our babies in Vietnam and in our own backyard."

The expanded air war did not deter the Communist Party, however, and it continued to make hard demands in Paris. Nixon's Vietnamization plan temporarily quieted domestic critics, but his continued reliance on an expanded air war to provide cover for an American retreat angered U.S. citizens. By the early fall 1972, U.S. Secretary of State Henry Kissinger and DRV representatives Xuan Thuy and Le Duc Tho had hammered out a preliminary peace draft. Washington and Hanoi assumed that its southern allies would naturally accept any agreement drawn up in Paris, but this was not to pass. The leaders in Saigon, especially President Nguyen van Thieu and Vice President Nguyen Cao Ky, rejected the Kissinger-Tho peace draft, demanding that no concessions be made. The conflict intensified in December 1972, when the Nixon administration unleashed a series of deadly bombing raids against targets in the DRV's largest cities, Hanoi and Haiphong. These attacks, now known as the Christmas bombings, brought immediate condemnation from the international community and forced the Nixon administration to reconsider its tactics and negotiation strategy.

The Paris Peace Agreement
In early January 1973, the Nixon White House convinced the Thieu-Ky regime in Saigon that they would not abandon the GVN if they signed onto the peace accord. On January 23, therefore, the final draft was initialed, ending open hostilities between the United States and the DRV. The Paris Peace Agreement did not end the conflict in Vietnam, however, as the Thieu-Ky regime continued to battle Communist forces. From March 1973 until the fall of Saigon on April 30, 1975, ARVN forces tried desperately to save the South from political and military collapse. The end finally came, however, as DRV tanks rolled south along National Highway One. On the morning of April 30, Communist forces captured the presidential palace in Saigon, ending the Second Indochina War.