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### The Korean War (1950–1953)

Following World War II, Korea was divided at the \(38^{th}\) Parallel. The North was established as a Communist state under Kim Il Sung, supported by the Soviet Union and China, while the South became a democratic state under Syngman Rhee, supported by the United States.

*   Outbreak: In June 1950, North Korea invaded the South. The United Nations authorized a police action, and General Douglas MacArthur was named Commander of the UN forces.

*   American Counterattack: MacArthur led a successful amphibious assault at Inchon, pushing North Korean forces back toward the Chinese border.

*   Chinese Intervention: Fearing an American invasion, China entered the war in late 1950, launching a massive counterattack that pushed UN forces back below the \(38^{th}\) Parallel.

*   Stalemate and Armistice: Conflict arose between President Truman and MacArthur; MacArthur wanted to use nuclear weapons against China and was eventually fired for insubordination. In 1953, under President Eisenhower, an armistice was signed. The border remained at the \(38^{th}\) Parallel, and the war ended in a stalemate.

### The Vietnam War

The conflict in Vietnam was rooted in the decolonization movement after France lost its grip on "Indochina."

*   Escalation: Vietnam was divided at the \(17^{th}\) Parallel. The North was led by Ho Chi Minh (Communist), and the South was led by Ngo Dinh Diem. The U.S. supported the South due to the "Domino Theory"—the belief that if one country fell to Communism, others would follow.

*   U.S. Involvement: After Diem was assassinated and the Gulf of Tonkin incident occurred, President Lyndon B. Johnson escalated the war, eventually sending 500,000 troops.

*   Warfare: The U.S. struggled against the Viet Cong, a guerrilla organization in the South. Despite high body counts, the U.S. could not break the North Vietnamese spirit.

*   The Turning Point: The 1968 Tet Offensive was a massive military failure for the North, but a psychological victory. It showed the American public that the war was far from over, leading to widespread protests.

*   End of the War: President Nixon implemented "Vietnamization" but also used heavy bombing (NAPALM and Agent Orange). The U.S. withdrew in 1975, and South Vietnam was quickly overrun by the North.

### Post-WWII China

After WWII, China resumed a civil war between the Nationalists (Chiang Kai-Shek) and the Communists (Mao Zedong).

*   Communist Victory: In 1949, Mao Zedong's forces won, and the Nationalists fled to Taiwan.

*   The Great Leap Forward: Launched in 1958, this was Mao’s attempt to modernize China’s economy. It resulted in a massive famine that killed an estimated 40 million people.

*   Tiananmen Square: In 1989, student-led protests for democracy in Beijing were met with a violent military crackdown, resulting in thousands of deaths.

### Middle Eastern Terrorism and Conflict

The late \(20^{th}\) century saw a rise in regional instability and the birth of modern terrorism.

*   The PLO: Led by Yasser Arafat, the Palestine Liberation Organization used terrorism and hijackings to push for Palestinian statehood.

*   OPEC: The Organization of Petroleum Exporting Countries regulated oil prices, using oil as a political weapon against Western nations.

*   Iran-Iraq War: A decade-long conflict (1980–1988) between Saddam Hussein’s Iraq and Ayatollah Khomeini’s Iran. It ended in a stalemate.

*   The Persian Gulf War: In 1990, Iraq invaded Kuwait. A U.S.-led coalition quickly defeated Iraqi forces in 1991, asserting American military dominance.

*   September 11, 2001: Al-Qaeda terrorists hijacked four planes, attacking the Twin Towers and the Pentagon. This event fundamentally changed global security and led to the "War on Terror."