Why did the united states intervene in korea during the mid-twentieth century?

The peoples of Korea and the Philippines have suffered significant U.S. intervention in their affairs throughout the twentieth century: at the beginning when the U.S. government was engaged in a policy of colonization; at mid-century when the U.S. military interventions of the Second World War merged into those of the Cold War; in the 1960s and 1970s when U.S. Cold War policy led to the Vietnam war, and in the 1980s when the Cold War was coming to an end.

These interventions have occurred almost simultaneously in the two countries and usually have taken similar forms, suggesting a common U.S. policy. Although the forms of these interventions have changed with changing circumstances, their purpose remained constant: promoting the economic and military interests of the ruling class of the United States.

Colonization

At the beginning of the twentieth century the United States and Japan came late to the race for colonial territory that had occupied the major European powers for the last quarter of the nineteenth century. Since so much of the world had already been claimed by Europe when they came on the scene, the United States and Japan followed a similar course: defeating weaker powers and taking over their colonies.

In 1898, the United States vanquished Spain and took over the Philippines, Puerto Rico, and Cuba. But before the United States established its colonial rule in the Philippines it conducted a harsh war of conquest against Philippine nationalists, leaving some 600,000 dead on the island of Luzon alone. In 1895, Japan defeated China and took over Manchuria and Korea as spheres of influence. Tsarist Russia began to challenge Japanese ascendancy in these areas, but was defeated by Japan in 1905 in a war that once more brought Korea under Japanese control.

Japan encountered bitter nationalist resistance as it began to exercise its sway in Korea, as did the United States in the Philippines. As both powers were consolidating their newly acquired dominions at the same time, they signed what became known as the Taft-Katsura agreement, which stipulated that the United States would recognize and not interfere with Japanese suzerainty in Korea and Japan would reciprocate in the Philippines. In this way the two budding imperialist powers secured their flanks from one another in order to concentrate on bringing their newly acquired subjects under control.

In Korea, the Japanese set up an autocratic rule, whereas in the Philippines the United States used certain democratic forms, including a Philippine congress, elected by voters with property qualifications. The U.S. colonial intervention in the Philippines lasted from 1899 to 1946 [save for three years of Japanese occupation during the Second World War], while Japan ruled Korea from 1905 to 1945. Three additional interventions in both countries extend from the 1950s to the present.

The Cold War

In the final stages of the Second World War the United States intervened to secure the defeat of Japanese rule in both the Philippines and Korea. In the former, the U.S. military and Philippine guerrilla forces carried...

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The Cold War conflict was a civil war that became a proxy battle between the superpowers as they clashed over communism and democracy.

  • Author:

    Jessica Pearce Rotondi

  • Updated:

    Dec 13, 2021

    Original:

    May 7, 2021

Bettmann Archive/Getty Images

The Cold War conflict was a civil war that became a proxy battle between the superpowers as they clashed over communism and democracy.

The Korean War [1950-1953] was the first military action of the Cold War. It was sparked by the June 25, 1950 invasion of South Korea by 75,000 members of the North Korean People’s Army. The line they crossed, the 38th parallel, was created in 1945 to separate the Soviet-supported Democratic People’s Republic of Korea [today’s North Korea] and the U.S.-supported Republic of Korea to the South. The Korean War was a civil conflict that became a proxy war between superpowers clashing over communism and democracy. Between 2 and 4 million people died, 70 percent of them civilians. No peace treaty was ever signed, although in December 2021, North and South Korea, the United States and China agreed to declare a formal end to the war.

WATCH: The Korean War: Fire & Ice on HISTORY Vault

What Caused the Korean War?

“The Korean War was a civil war,” says Charles Kim, Korea Foundation associate professor, Department of History, University of Wisconsin-Madison. Korea was a unified kingdom for centuries before Japan annexed it following their victory in the Russo-Japanese War. The Japanese ruled over Korea with an iron fist from 1910-1945. They used assimilation tactics like forbidding the Korean language and de-emphasizing Korean history in favor of Japanese culture to weaken their colony.

When Japan surrendered to the Allies following the dropping of atomic bombs on Hiroshima and Nagasaki during World War II, control of the Korean peninsula passed from Japan to the Americans and the Soviet Union. The superpowers chose to divide Korea between themselves at the 38th parallel, which roughly bisected the peninsula. “It didn’t correspond to political, cultural, or terrain boundaries,” Kim says. The Soviets set up a communist government to the North, and the United States helped establish a military government in the South.

The DMZ line at the demilitarized zone between South and North Korea, 1990. [Credit: Kurita KAKU/Gamma-Rapho via Getty Images]

“At the time, Korean politics ran the gamut from communism on the extreme left to right-wing nationalists, all vying for power,” Kim says. “There was a lot of contention between the Soviet and U.S. occupation forces, and with the polarization of Korean leadership, it was a volatile situation,” says Kim. “Each viewed the other as illegitimate. Both wanted to invade the other to unify Korea.”

Scattered border skirmishes from 1948-50 kept tensions simmering. In 1948, the United States called on the United Nations to sponsor a vote for Koreans to determine their future government. When the North refused to participate, the South formed its own government in Seoul under the anti-communist Syngman Rhee. In retaliation, Kim Il Sung, a former communist guerilla, was named Premier of the Democratic People’s Republic of Korea [DPRK].

Kim Il Sung went to Moscow in 1949 and again in 1950 to seek Soviet support for invading South Korea. “He was able to get Joseph Stalin to commit to providing support for the invasion of South Korea. He also got a verbal commitment from China,” Kim says.

When North Korea invaded South Korea on June 25, 1950, “North Korea was banking on the U.S. not coming back,” says Kim. North Korean forces were strong; they had the aid of experienced veterans of the Chinese Civil War, which had just ended in August of 1949. North Koreans made swift progress southward. The world watched to see what would happen next.

Why Did the U.S. Get Involved in the Korean War?

“The U.S. initially didn’t want to get involved in any kind of invasion. They didn’t want to get tangled up with North Korea, much less China or the Soviet Union,” says Kim. Key events on the world stage caused the United States to change course.

On August 29, 1949, the Soviets detonated their first atomic bomb. Klaus Fuchs, a physicist who had helped the United States build its atomic bomb program, had leaked the blueprint of the “Fat Man” atomic bomb to the Soviets. The revelation stoked Cold War paranoia. Then, on October 1, 1949, communist revolutionary Mao Zedong announced the creation of the People’s Republic of China following the defeat of the U.S.-supported Chinese nationalists led by Chiang Kai-shek. “‘The loss of China’ was a phrase used by Republican critics of the Truman administration,” says Kim.

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Thousands of Chinese troops were sent to aid the North Koreans. “Mao Zedong was adamant about helping out his North Korean allies. He wanted to improve China’s prestige in the communist world by what he saw as freeing South Koreans from U.S. imperialist rule,” Kim says.

President Truman Orders U.S. Forces to South Korea

On April 14, 1950, Truman received a document called National Security Council Paper Number 68 [NSC-68]. Created by the Defense Department, the State Department, the CIA, and other agencies, it advised the president to grow the defense industry to counter what these agencies saw as the threat of global communism. The recommendations cemented Truman’s next move.

On June 27, 1950, President Truman ordered U.S. forces to South Korea to repulse the North’s invasion. “Democrats needed to look tough on communism,” Kim says. “Truman used Korea to send a message that the U.S. will contain communism and come to the aid of their allies.”

The United States never formally declared war on North Korea. Instead, Truman referred to the addition of ground troops as a “police action.” U.S. General Douglas MacArthur’s Inch’on landing on September 8, 1950, turned the tide of the war and enabled Southern forces to push Northward beyond the 38th parallel.

On December 16, 1950 U.S. President Harry Truman declared a state of emergency, proclaiming that “communist imperialism” was a threat to democracy. 

Read more: 10 Famous Korean War Veterans

Impact of the Korean War

The Korean War armistice, signed on July 27, 1953, drew a new border between North Korea and South Korea, granting South Korea some additional territory and demilitarizing the zone between the two nations. A formal peace treaty was never signed.

Over 2.5 million people died in the Korean War. Despite two prisoner of war exchanges, Operation Little Switch and Operation Big Switch, 7,800 Americans are still missing in action, while South Korea is still searching for over 124,000 servicemen.

READ MORE: The Most Harrowing Battle of the Korean War

“The absence of a final conclusion to the Korean War has kept it alive as a major influence on Asian affairs,” says Sheila Miyoshi Jager, professor of East Asian Studies at Oberlin and author of Brothers at War: The Unending Conflict in Korea. 

She argues the Korean War directly influenced President Lyndon B. Johnson’s policy in Vietnam: “Here was a successful sovereign nation, divided by the Cold War, being threatened by its communist neighbor backed by China and the Soviet Union. Korea was now seen as a war that had successfully stopped the Chinese communist expansion in Asia.”

Sandwiched between World War II and The Vietnam War, The Korean War was nicknamed “The Forgotten War.” But to Jager, it’s not over: “The Korean War continues to influence events in East Asia,” she says. Tensions between the United States and North Korea remain.

By

Jessica Pearce Rotondi

Jessica Pearce Rotondi is the author of What We Inherit: A Secret War and a Family’s Search for Answers.

Why did the US intervene in Korea?

America wanted not just to contain communism - they also wanted to prevent the domino effect. Truman was worried that if Korea fell, the next country to fall would be Japan, which was very important for American trade.

Why did the US get involved in the Korean War quizlet?

Why did the U.S get involved in the Korean War? Primarily because of the threat of Communist expansion by China, along with fear that the SU was working with China to create bombs. Plus, Korea was positioned at the 38th Parallel, which makes it an important point to hold in the area for political control.

How did the US become involved in the Korean conflict?

On June 27, 1950, U.S. President Harry Truman announced support for South Korea in repelling an invasion by North Korea, entering the U.S. in the Korean War.

What triggered US military action in Korea in 1950?

In June 1950 communist North Korea invaded South Korea. The United States came to the aid of South Korea at the head of a United Nations force composed of more than a dozen countries. Communist China joined North Korea in the war in November 1950, unleashing a massive Chinese ground attack against American forces.

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