Correct answer:
<h2>A) Johnson explains the reason for US involvement, while Nixon explains the need to end the war.</h2>
Explanation:
President Lyndon Johnson's words are an illustration of "domino theory." Domino theory was the idea that the spread of communism in Vietnam would result in other countries in the region falling like dominoes to the influence of communism. During his administration, after obtaining the Gulf of Tonkin resolution from Congress, President Johnson escalated US involvement in the war and magnified the number of US troops there by hundreds of thousands. Between 1964 and the end of Johnson's presidency in 1969, US troop levels in Vietnam increased from around 20,000 to over 500,000
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President Richard Nixon had instituted a policy of "Vietnamization" in regard to the Vietnam War, which emphasized that the United States needed to empower South Vietnamese forces to assume more combat duties. He proposed drawing down US involvement in the war and seeking "peace with honor," as he put it. By the time that President Nixon and US policy shifted to this sort of policy, it was too late to stave off the victory of the North Vietnamese and Viet Cong forces. The US eventually withdrew its forces from Vietnam in 1973, and by 1975, Saigon (in South Vietnam) fell to the North Vietnamese communist forces.
