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Korean War Timeline
The Korean War was the first major military conflict of the Cold War, in which the United States and its allies fought to defend South Korea from a communist invasion — ending in a stalemate that divides Korea to this day.
Put the Events in Order
The events shuffled, to number from first to last. With answer key.
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When Japan was defeated in World War II, Korea — which Japan had colonized since 1910 — was divided at the 38th parallel between Soviet-occupied North Korea and US-occupied South Korea. What was supposed to be a temporary arrangement hardened into two hostile states. On June 25, 1950, North Korean forces suddenly invaded South Korea, nearly overrunning the entire peninsula before a United Nations force led by the US pushed them back. Then China entered the war with hundreds of thousands of troops, pushing the UN force back south. After two years of grinding trench warfare near the original dividing line, an armistice was signed in July 1953. The shooting stopped — but the war was never officially ended.
- 1945
Korea Divided
After Japan's defeat in World War II, Korea is divided at the 38th parallel between Soviet-occupied North Korea and US-occupied South Korea.
Why it mattered: The division, meant to be temporary, hardened into two hostile states — communist North Korea and non-communist South Korea — with no agreement on how or whether to reunify.
- 1948
Two Koreas Established
The Democratic People's Republic of Korea (North) and the Republic of Korea (South) are formally established as separate governments.
Why it mattered: With two rival governments each backed by an opposing superpower, the Korean peninsula became one of the most dangerous flashpoints of the Cold War.
- June 25, 1950
North Korea Invades
North Korean forces cross the 38th parallel and invade South Korea, rapidly overrunning most of the peninsula.
Why it mattered: The surprise invasion nearly succeeded — within weeks UN forces were pushed into a small corner of southern Korea around the port of Pusan, fighting for survival.
- September 1950
Inchon Landing
General Douglas MacArthur leads a bold amphibious landing at Inchon, behind North Korean lines, cutting off the invaders and turning the tide of the war.
Why it mattered: The Inchon landing was one of the most daring operations of the war — it cut North Korean supply lines and allowed UN forces to rapidly retake South Korea.
- October 1950
China Enters the War
As UN forces approach the Chinese border, China sends hundreds of thousands of troops across the Yalu River, pushing UN forces back south in brutal winter fighting.
Why it mattered: China's intervention transformed the war — what had seemed like a near-victory became a grinding stalemate fought near the original dividing line.
- April 1951
MacArthur Fired
President Truman fires General MacArthur for publicly criticizing the administration's decision to limit the war and not attack China directly.
Why it mattered: MacArthur's firing reinforced the crucial democratic principle that military commanders are subordinate to civilian leadership — even in wartime.
- 1951–53
Stalemate and Trench Warfare
The front stabilizes near the 38th parallel; both sides dig in for two years of grinding warfare while peace talks drag on.
Why it mattered: The stalemate was enormously costly — hundreds of thousands of soldiers died while negotiators argued over the precise location of the ceasefire line.
- 1952
Eisenhower Elected
Dwight Eisenhower wins the presidential election largely by promising to visit Korea and end the war.
Why it mattered: Eisenhower's election shifted the political pressure to end the war, and hints that he might consider using nuclear weapons accelerated the peace negotiations.
- July 27, 1953
Armistice Signed
An armistice is signed at Panmunjom, ending the fighting; the boundary between North and South Korea is fixed near the 38th parallel.
Why it mattered: The armistice ended the shooting — but it was not a peace treaty. Technically, North and South Korea remain at war to this day.
- 1953 onward
The Divided Peninsula
The Demilitarized Zone — a 2.5-mile-wide buffer strip across the peninsula — becomes one of the most heavily fortified borders on Earth.
Why it mattered: The Korean War ended exactly where it started — with a divided Korea. North Korea became a closed authoritarian state; South Korea eventually became a democracy and economic powerhouse.
Korean War Quiz
Check what you learned — read on screen, or download the Quiz with Answer Key above for a worksheet version.
Why was Korea divided after World War II?
- A) China and the US each occupied half after the Korean War began
- B) Japan split it into two colonies before surrendering in 1945
- C) The US and Soviet Union each occupied half after Japan's defeat
- D) The Korean people voted in 1948 to split into two separate countries
What happened on June 25, 1950?
- A) UN forces landed at Inchon behind North Korean lines
- B) North Korean forces invaded South Korea in a surprise attack
- C) An armistice was signed at Panmunjom to stop the fighting
- D) Chinese forces crossed the Yalu River and attacked the UN troops
What was the Inchon Landing?
- A) A landing by Chinese troops across the Yalu River that pushed the UN back
- B) A landing by Soviet troops in North Korea at the end of World War II
- C) A landing by North Korean troops near Pusan that began the war
- D) A landing by MacArthur behind North Korean lines that turned the war
Why did China enter the Korean War in October 1950?
- A) UN forces were nearing its border, and it feared a hostile army there
- B) South Korea had invaded Chinese territory across the Yalu River
- C) Japan had rejoined the war, and it feared another Japanese invasion of China
- D) The United States asked it to help push back North Korea
Why was General MacArthur fired by President Truman?
- A) He publicly criticized Truman's decision to limit the war
- B) He signed a ceasefire with North Korea without Truman's approval
- C) He retreated from Inchon without orders from Truman
- D) He refused Truman's order to cross the 38th parallel
What was the result of the Korean War armistice of 1953?
- A) Fighting stopped after a peace treaty set elections to reunite Korea
- B) Fighting stopped at Pusan, and Korea was united under the North
- C) Fighting stopped at the Yalu River, and Korea was united under the South
- D) Fighting stopped near the 38th parallel, but no peace treaty was signed
Why is the Korean War sometimes called the Forgotten War?
- A) It involved no American troops, so US newspapers ignored it
- B) It was overshadowed by World War II before it and Vietnam after it
- C) It was fought in secret, and its records were sealed for 50 years
- D) It lasted only a few weeks and caused very few casualties
What separates North and South Korea today?
- A) The Yalu River, which forms a natural border between the two countries
- B) The Pusan Perimeter, a line of forts built across the southern coast
- C) The Demilitarized Zone, a guarded strip of land near the 38th parallel
- D) The Sea of Japan, which lies between the two halves of the peninsula
Show answer key
1. C · 2. B · 3. D · 4. A · 5. A · 6. D · 7. B · 8. C
Related timelines
Cold War Timeline — The Cold War was a decades-long rivalry between the United States and the Soviet Union, fought through arms races, proxy wars, and the constant threat of nuclear destruction. Open →
Vietnam War Timeline — The Vietnam War was a long and deeply divisive conflict in which the United States spent two decades trying to prevent a communist takeover of South Vietnam — and ultimately failed. Open →
How to print
Every sheet above is a ready-to-print PDF sized for US Letter paper (8.5 × 11"). The fill-in version keeps the dates and gives students lines to write each event, with the events listed at the bottom to place — good for review. The ordering activity and the quiz each end with an answer key.
Frequently asked questions
Is the Korean War over?
Technically, no. The Korean War ended in a military armistice in July 1953, not a peace treaty. This means North and South Korea are still officially in a state of war, though no fighting has occurred since 1953. The Demilitarized Zone remains one of the most heavily fortified borders in the world. Periodic negotiations over the decades have not produced a permanent peace settlement, and North Korea's nuclear weapons program has made the situation more dangerous in recent decades.
Why is the Korean War called the Forgotten War?
The Korean War is often called the Forgotten War because it was sandwiched between World War II — the most dramatic conflict in American history — and the Vietnam War, which deeply divided American society. More than 36,000 Americans died in Korea and the war reshaped the Cold War, yet it receives relatively little attention in American memory compared to those conflicts. It was the first major hot-war test of the Cold War and established that the US would use military force to resist communist expansion.
What paper size should I print this on?
The timeline is sized for standard US Letter paper (8.5 × 11 in.). The Download PDF button gives you a print-ready file that fits the page automatically.