Answer:
This conflict began on June 25, 1950, when North Korea, a communist nation, invaded South Korea. By invading South Korea, North Korea hoped to reunite the two nations as a single country under communism. With this invasion the United States feared the spread of communism, If America allowed soviets to take Korea and Vietnam, other parts of Asia would be at stake. The decision to engage in war in Vietnam and Korea had its ideological root in the Truman Doctrine which found clear expression in MacNamara's so called "Domino Theory". America reasoned that if first Korea and then Vietnam fell to communists, many other nations in proximity would be at risk. The Vietnam War started due to the same concern, The north had the support of communist allies including the Soviet Union and China, while the south had the support of the west with the United States. The two wars were the same ideological background, the confrontation of two super nations, the US and the URSS, and their economic and political systems.
The Korean war was the result of a dispute between North and South Korea while the Vietnam war was initiated due to the conflict between North Vietnam against South Vietnam.
Both wars were caused by the cold war in the form of a civil war arising due to disagreement in the ideologies of Nationalists and Communists. The war was supported by the US in order to restrict the rise of communism in other nations.
Therefore, during WWII the methods used in both war was different but the ideological background behind the war was the same.
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