• Japanese Occupation (1905 – 1945)
– Protectorate declared in 1905; full annexation in 1910.
– “Iron-fist” rule: Koreans denied political rights; Japanese police & military held absolute power.
– Continuous but fragmented resistance in the 1920s–1930s; all risings severely crushed.
– Occupation left deep social wounds: collaboration vs. resistance would later fuel post-war reprisals.
• Post-WWII Allied Planning
– Potsdam Conference (July 1945): Allies agree Korea “should become independent,” but no consensus on governmental form.
– Decision: temporary occupation to disarm Japan & maintain order.
– 38^{th} Parallel chosen (U.S. proposal) to demarcate Soviet (North) & U.S. (South) occupation zones.
• Occupation Realities
– North: Red Army installs local “People’s Committees” dominated by communists; Kim Il Sung groomed as leader.
– South: U.S. Military Government in Korea (USAMGIK) rules via General Hodge; relies on pre-existing Japanese police, angering nationalists.
– Grass-roots “Committee for the Preparation of Korean Independence” tries to fill power vacuum but is ignored by both super-powers.
• Revenge & Social Turmoil
– Waves of reprisals against collaborators; political polarization accelerates.
– Ideological violence (Left–Right clashes) begins even before formal states are created.
• Failure of Great-Power Trusteeship
– Joint U.S.–USSR Commission ( 1946–1947 ) agrees on need for provisional government yet deadlocks over eligibility of Korean parties.
– UN steps in (Nov. 1947): calls for peninsula-wide elections. Soviets refuse access in the North, ensuring two separate states.
• Republic of Korea (ROK – South)
– UN-supervised elections (May 10); Syngman Rhee becomes president (Aug. 15).
– Platform: militant anti-communism, immediate independence, strong central authority.
– Authoritarian rule: censorship, anti-Left purges (e.g. a0Jeju Massacre).
– U.S. military withdrawal target: June 1949 (though advisory presence remains).
• Democratic People’s Republic of Korea (DPRK – North)
– Formal proclamation: Sept. 9 1948; Kim Il Sung premier.
– Soviet troops depart late 1948, leaving behind equipment & advisers.
– System: single-party communist state; cult of personality + Juche (self-sufficiency).
• Common Goal
– Both Rhee & Kim claim exclusive legitimacy and vow to reunify Korea under their own systems.
• Kim Il Sung
– Guerrilla against Japan; trained/marshaled by the USSR.
– Utilises propaganda to craft the “Great Leader” image.
– Doctrine: Juche → economic autarky & diplomatic isolation.
• Syngman Rhee
– U.S-educated, fluent English; impeccable anti-communist credentials.
– Governs via emergency decrees, police terror, extensive prison network.
• Chinese Civil War Outcome
– CCP wins (Oct. 1949); PRC proclaimed by Mao Zedong.
– GMD retreats to Taiwan; U.S. refuses PRC recognition.
– Raises stakes in Korea: peninsula now a front line between communist bloc & U.S. sphere.
• Super-Power Calculus Pre-1950
– USSR / Stalin: initially prioritises European buffer; cautious about direct clash with U.S.; later tempted by possible quick DPRK victory & Chinese backup.
– USA / Truman–Acheson: announces “Defensive Perimeter” (Jan. 1950) omitting Korea, signalling limited commitment; NSC-68 (Apr. 1950) reverses course → advocates global, militarised containment.
• Border Skirmishes
– Throughout 1949: raids & counter-raids along 38^{th} Parallel; Rhee’s forces even strike North Korean installations hoping to spark U.S. aid.
• DPRK Offensive
– 90,000 North Korean troops, T-34 tanks cross 38^{th} Parallel at 0400 hrs.
– Seoul captured within 3 days; ROK forces retreat southwards (“Pusan Perimeter”).
• U.S. & UN Reaction
– USSR is boycotting UN Security Council over China seat; cannot veto U.S. resolution.
– UNSC Res 83 condemns DPRK; Res 84 creates UN Command under Gen. Douglas MacArthur.
– Multinational force: 16 combat-troop nations (e.g. a0USA, UK, Turkey, Australia) + 5 medical/transport contributors.
• Phases of Combat
• Wartime Perspectives & Propaganda
– Each side frames conflict as liberation from foreign puppets.
– U.S. portrays defence of the “Free World”; PRC depicts resistance to American imperialism.
• Negotiation Obstacles
– POW repatriation: U.S./ROK insist on voluntary return; DPRK/PRC demand all POWs.
– Rhee sabotages talks (e.g. a0releases 25,000 anti-communist POWs in 1953).
– Stalin & Mao value U.S. force diversion + PLA combat experience.
• Cease-Fire ( 27 July 1953 )
– Korean Armistice Agreement signed at Panmunjom.
– Creates Demilitarised Zone: 250 km long × 4 km wide ( 2 km each side ); militarily off-limits but heavily fortified.
– Joint Security Area (JSA): single meeting point for both armies.
• Casualties: 3–4 million total; ≈ 1.4 million killed.
• Refugees: hundreds of thousands displaced.
• North Korean industry: 70\% textile/chemical, 51\% mining capacity destroyed by U.S. bombing.
• Korean Peninsula
– Enduring division; no peace treaty → state of technical war persists.
– North: reconstruction under Soviet/Chinese aid; tightened autarky & personality cult.
– South: U.S. economic assistance; authoritarianism continues (Rhee overthrown 1960) yet seeds of export-driven growth planted.
• U.S. Foreign Policy
– Containment globalised: NSC-68 fully embraced.
– Permanent U.S. forces in Korea, Japan, Philippines.
– Creation of anti-communist alliances:
• SEATO (Sept 1954) – SE Asia.
• CENTO (Baghdad Pact, 1955) – Middle East/Central Asia.
– Military spending soars; U.S. armed forces double by 1951.
– NATO allies raise defence budgets above 12\% of GDP by 1953; 15 divisions stationed in West Germany.
• Civil War Elements
– Indigenous rivalry for unification; pre-1950 clashes largely Korean-instigated.
– Shared language, culture, history → fratricidal dimension.
• Proxy War Elements
– Super-powers supply arms, advisers, strategic direction; no direct U.S.–USSR troops clash but massive matériel aid.
– Chinese “volunteers” & Soviet pilots (in Chinese-marked planes) embody indirect great-power combat.
– Set template for future Cold-War flashpoints (Vietnam, Afghanistan, Angola).
• Demonstrated destructiveness of limited wars in nuclear age; incentive to fight through proxies.
• Highlighted dilemma of humanitarian cost vs. ideological containment.
• Cemented notion of collective security under UN yet exposed dependence on super-power politics (Security-Council boycott loophole).
• 38^{th} Parallel – Latitude line dividing occupation zones; later frontline.
• Armistice – Cease-fire without peace treaty (still in effect).
• Authoritarianism – Concentrated executive power; limited political freedom (both Koreas).
• Cold War – Ideological, geopolitical rivalry U.S.–USSR, characterised by proxy wars.
• Containment – U.S. strategy to prevent spread of communism.
• Cult of Personality – Leader glorification (Kim Il Sung).
• DMZ – 250 km neutral buffer; world’s most fortified border.
• Juche – DPRK ideology of self-reliance.
• NSC-68 – U.S. report advocating large military build-up.
• Proxy War – Indirect super-power contest through local actors.
• Short-Answer / Quiz Themes
– Japanese colonial policies & Korean resistance.
– Potsdam & 38^{th} Parallel rationale.
– Super-power mistrust blocking provisional unity.
– Leadership traits of Kim Il Sung & Syngman Rhee.
– Impact of Acheson’s Perimeter & Chinese Civil-War outcome on U.S./USSR policy.
– UN decision-making process under Soviet boycott.
– Causes for prolonged negotiations (POW issue, strategic calculus).
– Structure & purpose of the DMZ.
• Essay-Style Questions
– “To what extent was the Korean War primarily a civil conflict?”
– “Analyse U.S. & Soviet policy shifts 1945–1950.”
– “Assess short- and long-term impacts on DPRK & ROK.”
– “Evaluate the war as the first Cold-War military conflict.”
– “Compare leadership styles/goals of Kim & Rhee.”
These bullet-point notes integrate all critical data, explanations, numbers, and conceptual linkages required for a comprehensive understanding of the Korean War as presented in the source material.