Analyze the Second Red Scare and McCarthyism, and explain how the Cold War and the Korean and Vietnam wars influenced domestic and international politics

Learning goal: Explain how the Second Red Scare and McCarthyism reflected Cold War fears in American society, and explain how the Cold War and the conflicts in Korea and Vietnam influenced both domestic and international politics.

The Second Red Scare. The first Red Scare followed World War I. The second, from the late 1940s to the mid-1950s, grew out of Cold War fears. Several real events fed it. In 1949 the Soviet Union tested an atomic bomb and communists won the civil war in China. In 1950 Alger Hiss, a former State Department official accused of passing documents to the Soviets, was convicted of perjury; Klaus Fuchs, a scientist who had worked on the atomic bomb, confessed to spying in Britain; and Julius and Ethel Rosenberg were arrested for atomic espionage and later executed in June 1953. Soviet cables decoded by U.S. intelligence, made public in 1995, confirmed that some Soviet spying had occurred. Fear was therefore not imaginary, but the response reached far beyond actual spies.

Tools of the scare. In 1947 President Truman ordered loyalty reviews of federal employees. The House Un-American Activities Committee (HUAC) held hearings on communist influence in Hollywood in 1947; ten writers and directors who refused to answer were jailed for contempt of Congress, and studios created a blacklist that kept suspected leftists from working. The McCarran Internal Security Act of 1950 required communist organizations to register. The Taft-Hartley Act of 1947 required union officers to swear that they were not communists. Loyalty oaths spread to teachers and university professors, and many people lost jobs over past memberships or associations without evidence of wrongdoing.

McCarthyism. In February 1950, Senator Joseph McCarthy of Wisconsin claimed in a speech in Wheeling, West Virginia, that he had a list of communists in the State Department. The number he cited changed in later retellings, and he never proved his charges. For four years he made accusations against officials, the army and others. McCarthyism now means making public accusations of disloyalty without proper evidence. It ended in stages: in the televised Army-McCarthy hearings of spring 1954, millions watched his tactics, and in December 1954 the Senate voted to censure him. The standard's key word is reflected: McCarthyism mirrored fears that already ran through society about spies, subversion and a communist world advancing on many fronts.

Korea. After World War II Korea was divided at the 38th parallel into a Soviet-backed North and a U.S.-backed South. On June 25, 1950, North Korea invaded the South. The UN Security Council, which the Soviet Union was then boycotting, authorized members to help South Korea, and U.S. forces led the UN effort. General Douglas MacArthur's landing at Inchon in September 1950 turned the war, and UN forces pushed north toward the Chinese border. China then entered the war in late 1950, driving them back. When MacArthur publicly pressed to expand the war to China, Truman relieved him of command in April 1951, asserting civilian control of the military. An armistice in July 1953 left Korea divided near the 38th parallel, where it remains.

Domestic effects of Korea: the war made Truman unpopular, helping Dwight Eisenhower win the 1952 election. Defense spending rose sharply as NSC-68 was put into practice. When a steel strike threatened war production in 1952, Truman seized the steel mills; in Youngstown Sheet & Tube Co. v. Sawyer (1952), a case named for the Ohio steel company, the Supreme Court ruled the seizure unconstitutional because Congress had not authorized it. International effects: containment was extended to Asia, the United States signed defense treaties in the Pacific, including a peace treaty and security pact with Japan in 1951 that turned a former enemy into an ally, and the idea of a limited war fought without nuclear weapons took hold.

Vietnam. After Vietnamese forces defeated France at Dien Bien Phu in 1954, the Geneva Accords temporarily divided Vietnam at the 17th parallel, with elections planned for 1956 that were never held. Under Eisenhower and Kennedy, the United States backed South Vietnam with money and advisers. In August 1964, after reported clashes with North Vietnamese boats, Congress passed the Gulf of Tonkin Resolution, giving President Johnson broad authority to use force. In 1965 Johnson began sustained bombing and sent ground combat troops; by 1968 more than half a million Americans were in Vietnam. The Tet Offensive of January 1968, though a military setback for the North, shocked Americans who had been told the war was being won. Johnson announced on March 31, 1968, that he would not seek reelection. Richard Nixon pursued "Vietnamization," withdrawing U.S. troops while expanding bombing, and in April 1970 announced an incursion into Cambodia. Campus protests followed, and on May 4, 1970, Ohio National Guard troops fired on students at Kent State University, killing four and wounding nine. The Paris Peace Accords of January 1973 ended U.S. combat; Saigon fell to North Vietnam in April 1975. More than 58,000 Americans died.

Domestic effects of Vietnam: a large antiwar movement; war costs that squeezed spending on Johnson's Great Society programs; a "credibility gap" as government statements conflicted with reports; the draft's end in 1973; the Twenty-sixth Amendment (1971) lowering the voting age to 18; and the War Powers Resolution (1973), passed over Nixon's veto, requiring the president to report to Congress within 48 hours of sending troops into hostilities and to withdraw them within 60 days, extendable by 30 days, unless Congress authorizes their use. International effects: a period of caution about foreign interventions and, under Nixon, détente with the Soviet Union and an opening to China in 1972.

Beyond Korea and Vietnam. The Cold War shaped U.S. actions in other regions too. In 1953 the CIA helped overthrow Iran's prime minister, Mohammad Mosaddegh, and in 1954 it backed a coup against Guatemala's elected president, Jacobo Árbenz; both were justified as containment and both left lasting resentment. After Fidel Castro's revolution of 1959 aligned Cuba with the Soviet Union, the failed Bay of Pigs invasion (April 1961) and the Cuban Missile Crisis (October 1962) followed. The missile crisis brought the superpowers close to nuclear war; at home it deepened fear and civil defense planning, and abroad it led to a hotline between Washington and Moscow and the Limited Test Ban Treaty of 1963.

A fully worked model. How did Korea affect domestic politics? Chain: invasion (1950) → U.S. war → NSC-68 buildup → higher defense spending and a steel dispute → Youngstown decision limiting presidential power; stalemate → Truman's unpopularity → Eisenhower elected (1952). One war, several domestic effects, each traceable.

The misconception. "McCarthy started the Red Scare." Loyalty programs and HUAC's Hollywood hearings were under way years before his 1950 speech; he exploited fears that already existed.

Worked example 1 — reflecting fears: Fear: communist spies in government. Evidence of real basis: the Hiss conviction and Rosenberg case. Excess: people lost jobs for past associations without evidence; McCarthy never proved his list. Conclusion: McCarthyism reflected real fears but magnified them into accusations without evidence.

Worked example 2 — Korea, international effects: The UN authorized action (June 1950) while the Soviets boycotted the Security Council; China entered (late 1950); the armistice (July 1953) left Korea divided near the 38th parallel. Effects: containment extended to Asia and the United States accepted a limited war rather than risk a wider or nuclear one.

Worked example 3 — Vietnam, domestic effects: Gulf of Tonkin Resolution (1964) gave the president broad power → escalation from 1965 → Tet (1968) and a credibility gap → Johnson withdraws from the 1968 race → Kent State (May 4, 1970) → War Powers Resolution (1973) reasserts Congress's role. Each step links the war to a change in American politics.

Domestic/international sort: Create a two-column chart for Korea and for Vietnam. Place each of at least six dated effects in the domestic or international column, and draw an arrow when a domestic effect produced an international one or the reverse.

Independent performance: Write an essay answering: "How did Cold War fears change American democracy between 1947 and 1975?" Success criteria: define McCarthyism; use at least two Second Red Scare events and at least three events from Korea or Vietnam with correct dates; explain one lasting change in law or government (for example the Youngstown decision, the Twenty-sixth Amendment or the War Powers Resolution); acknowledge that some Soviet espionage was real while evaluating the response; and label your judgment as interpretation.