Short answer
- The standard dates are 1947 to 1991: from President Truman's containment doctrine of March 12, 1947 to the dissolution of the Soviet Union in December 1991, a span of 44 years and 9 months.
- Some historians trace the conflict's roots to 1917, when the Bolshevik Revolution made Russia the world's first communist state and set ideology against ideology.
- Others start it in 1945, when the Second World War ended with the United States and the Soviet Union as the only great powers standing, dividing Europe between them.
- The end is equally debatable: the fall of the Berlin Wall in November 1989 and the Malta Summit that December ended the contest in Europe, two years before the Soviet Union itself disappeared.
- The name came first, or nearly: George Orwell used "cold war" in print in October 1945, and Bernard Baruch and Walter Lippmann made it famous in 1947.
Ask when the Cold War was, and the textbook answer comes back at once: 1947 to 1991, from the Truman Doctrine to the dissolution of the Soviet Union. That answer is serviceable, and this article uses it. But it is an answer historians chose, not one the events dictated. The Cold War had no declaration and no peace treaty, no first battle and no surrender ceremony. Its beginning and its end are judgments about when a rivalry became a system and when that system stopped operating, and reasonable historians place those moments in 1917, 1945, 1947, 1989, or 1991. What follows is the case for each date, so you can see what the standard answer includes and what it leaves out.
The Textbook Answer: 1947 to 1991
The conventional bracket runs from March 12, 1947, when President Harry S. Truman asked Congress to aid Greece and Turkey against communist pressure and announced that the United States would support free peoples resisting subjugation, to December 26, 1991, when the Soviet Union formally dissolved itself. On that reckoning the Cold War lasted 44 years and 9 months. It is the dating used by Wikipedia’s reference summary and by most school and university courses.
The appeal of these dates is their symmetry. In 1947 the United States publicly committed itself to containment, the strategy of blocking Soviet expansion, and organized its side of the contest. In 1991 one of the two contestants ceased to exist. A rivalry requires two parties and a stated contest; the textbook dates mark when both conditions were plainly met and when one of them plainly ended. Everything before 1947 can then be treated as origins, and everything after 1989 as an epilogue. Whether that tidiness clarifies or distorts is the argument.
Where the Name Came From
Unusually, we can date the label almost as precisely as the thing it labels. The English writer George Orwell used the phrase first in its modern sense, in his essay “You and the Atomic Bomb,” published in the newspaper Tribune on October 19, 1945, weeks after the Second World War ended. Contemplating a world of atomic superstates, Orwell warned of “a peace that is no peace,” a permanent state of “cold war” between powers too strong to conquer one another. Writing in The Observer on March 10, 1946, he applied the phrase to the real world: after the Moscow conference of December 1945, he wrote, Russia had begun to make a “cold war” on Britain and the British Empire.
The term entered politics on April 16, 1947, when Bernard Baruch, a financier and adviser to presidents, told the South Carolina legislature: “Let us not be deceived: we are today in the midst of a cold war.” The line was drafted for Baruch by the journalist Herbert Bayard Swope. Columnist Walter Lippmann then gave the phrase wide currency with his 1947 book The Cold War, a critique of containment assembled from his newspaper columns. Lippmann himself said he had taken the expression from a French phrase of the 1930s, la guerre froide. By the end of 1947, English had a name for the confrontation, which is one more reason the year 1947 feels like a beginning.
The Case for 1917: The Ideological Start
One school of interpretation holds that the Cold War was, at bottom, a contest between two ways of organizing society, and that this contest began the moment one of them seized a great state. In November 1917, in the middle of the First World War, the Bolsheviks under Vladimir Lenin overthrew Russia’s provisional government and founded the world’s first avowedly communist state, committed in principle to world revolution and the abolition of capitalism. From that point, on this reading, Soviet-American hostility was the default condition, interrupted only by necessity.
The evidence for deep roots is real. The Bolsheviks repudiated Russia’s war debts and seized foreign property. The United States and its allies intervened militarily in the Russian Civil War, landing troops at Archangel and Vladivostok in 1918 in support of the anti-Bolshevik Whites. Washington then refused to recognize the Soviet government for sixteen years, extending recognition only in 1933. Through the 1920s and 1930s, each side regarded the other as an ideological enemy whose system, if successful, would displace its own. Historians who favor this dating tend to see the wartime alliance of 1941 to 1945 as the interruption, an emergency partnership against Hitler, rather than the natural state of affairs whose breakdown needs explaining.
Against it stands a simple objection: between 1917 and 1945 the Soviet Union was one great power among several, preoccupied with survival and internal transformation, and the United States was largely withdrawn from European politics. There was hostility, but not yet a two-sided global system. Most historians therefore treat 1917 as the origin of the Cold War’s ideology rather than the start of the Cold War itself.
The Case for 1945: The Structural Start
A second case begins the story with the wreckage of 1945. By the spring of that year, every other great power was exhausted, occupied, or ruined. Britain was bankrupt, France and Germany prostrate, Japan defeated. Two states alone had the strength to order the postwar world, and at the Yalta Conference in February 1945 and the Potsdam Conference in July and August 1945, their leaders attempted to do it together, dividing Germany and Europe into occupation zones that hardened into spheres of influence. On this reading, the Cold War began as soon as the common enemy was gone, because the structure of world politics, two superpowers and no third, made rivalry nearly automatic.
The events of 1945 and 1946 lend it support. Soviet security services installed compliant governments in the states the Red Army had liberated. Disputes over Poland, Iran, and Germany poisoned the alliance within months of victory. On February 22, 1946, the American diplomat George Kennan sent his famous Long Telegram from Moscow, arguing that Soviet expansionism was driven by ideology and insecurity and had to be met with firm resistance; it became the intellectual foundation of containment. On March 5, 1946, Winston Churchill, speaking at Westminster College in Fulton, Missouri, with Truman in attendance, warned that an “iron curtain” had descended across Europe. If a cold war is a condition rather than a declaration, then by the spring of 1946 the condition existed, and some historians date the conflict from 1945 for exactly that reason.
The Case for 1947: The Declared Start
The majority view rests on 1947, and its argument is that a rivalry becomes a cold war when both sides organize for it openly and permanently. Through 1946 the confrontation was still improvised. In 1947 it acquired doctrine, budgets, and institutions. The Truman Doctrine of March 12, 1947 committed the United States to resisting communist expansion worldwide, beginning with aid to Greece and Turkey. In June 1947, Secretary of State George Marshall proposed the Marshall Plan, the vast American program to rebuild Western Europe, which the Soviet Union forbade its satellites to join, splitting Europe’s economy in two. Kennan’s containment strategy was published and debated. The National Security Act of 1947 rebuilt the American military and intelligence establishment for a long peacetime contest.
What followed confirmed the system: the Berlin Blockade of 1948 to 1949, the founding of NATO on April 4, 1949, the Soviet Union’s first atomic bomb test on August 29, 1949, and the communist victory in China on October 1, 1949. Historians who date the Cold War from 1947 do not deny that tensions existed earlier. They argue that 1947 is when those tensions were converted into a stable, global, two-bloc order, which is the thing the term “the Cold War” actually names.
What the Conflict Looked Like
Whatever start date you choose, the thing being dated had a distinctive shape. It is called cold because the United States and the Soviet Union never fought each other directly. Nuclear weapons, and the doctrine of mutually assured destruction that grew up around them, made a direct war between the superpowers a risk neither would run. The rivalry was therefore displaced: into an arms race in nuclear and conventional weapons, into a space race (the Soviet satellite Sputnik in October 1957, Yuri Gagarin’s flight in April 1961, the American Moon landing in July 1969), into espionage and propaganda, and above all into proxy wars, in which one superpower, or both, armed and funded local combatants. For the people of Korea, Vietnam, and Afghanistan, the Cold War was not cold at all.
| Date | Event |
|---|---|
| June 1948 to May 1949 | Berlin Blockade: the USSR seals off West Berlin; the Western Allies supply it by air |
| April 4, 1949 | NATO founded; the Soviet atomic test follows on August 29, 1949 |
| June 25, 1950 to July 27, 1953 | Korean War: a proxy war ending in armistice, with no peace treaty to this day |
| May 14, 1955 | The Warsaw Pact formalizes the Eastern bloc |
| October 1957 to July 1969 | The Space Race, from Sputnik to the Apollo 11 Moon landing |
| October 1962 | Cuban Missile Crisis, the closest the superpowers came to nuclear war |
| 1965 to 1973 | Major American combat in the Vietnam War; Saigon falls on April 30, 1975 |
| December 1979 to February 1989 | Soviet war in Afghanistan, the USSR’s decade-long proxy quagmire |
| November 9, 1989 | The Berlin Wall is opened |
| December 26, 1991 | The Soviet Union is formally dissolved |
The Case for Ending in 1989
If the start is contested, so is the finish. By the late 1980s the Soviet leader Mikhail Gorbachev had abandoned the ideological contest: he spoke of a “common European home,” withdrew Soviet forces from Afghanistan by February 1989, and declined to use force when Eastern Europe’s communist governments began to fall. On November 9, 1989, the East German government, in confusion and under pressure, opened the Berlin Wall, and the physical symbol of the divided Europe that the Cold War had been fought over ceased to function. Three weeks later, on December 2 and 3, 1989, Gorbachev and President George H. W. Bush met at Malta and, in their public remarks, described a world leaving the Cold War behind. Many historians, and many of the participants, regard Malta and the Wall as the real end: after December 1989 there was no longer an ideological contest for Europe, no Iron Curtain, and no serious prospect of war between the blocs. On this view, what happened in 1990 and 1991 was the settlement of the estate.
The Case for Ending in 1991
The rejoinder is that an estate settlement is still part of the story, and that the Cold War cannot be over while one of its two protagonists still exists in its old form. German reunification came on October 3, 1990, inside NATO, an outcome the Cold War’s logic had held impossible for forty years. The Warsaw Pact, the Eastern bloc’s alliance, was formally dissolved on July 1, 1991. In August 1991, Soviet hardliners attempted a coup against Gorbachev and failed, destroying what authority the Soviet center retained. On December 8, 1991, the leaders of Russia, Ukraine, and Belarus signed the Belovezha Accords, declaring the Soviet Union dissolved. Gorbachev resigned on December 25, 1991, and the Soviet flag was lowered over the Kremlin that evening; on December 26, the Soviet legislature formally dissolved the Union. With that, the bipolar world the Cold War described no longer existed, which is why 1991 remains the standard end date.
So Which Dates Should You Use?
Use 1947 to 1991 when you need one answer: an exam, a timeline, a reference work. It brackets the period when two organized blocs, led by two superpowers armed with nuclear weapons, contested the world between them, and it is the dating the widest body of scholarship shares. Use the alternatives when the question is really about causes or consequences. If you are explaining why the rivalry ran so deep, you will end up in 1917. If you are explaining how it became possible, you will start in 1945. And if you are explaining when Europeans stopped living inside it, 1989 is the honest date. The candidates, in one view:
| Start date | Claim | Who argues it |
|---|---|---|
| 1917 | The ideological contest begins with the Bolshevik Revolution | Historians emphasizing ideology and the long roots of hostility |
| 1945 | Two superpowers emerge from the Second World War and divide Europe | Historians emphasizing structure and the postwar settlement |
| 1947 | Containment is declared and the blocs organize (textbook standard) | The majority convention in reference works and teaching |
| End date | Claim | Who argues it |
|---|---|---|
| 1989 | The Wall falls and Malta closes the contest in Europe | Historians emphasizing events and lived experience in Europe |
| 1991 | The Soviet Union dissolves, ending the bipolar system (textbook standard) | The majority convention in reference works and teaching |
Frequently Asked Questions
When did the Cold War start?
The standard answer is 1947, anchored to the Truman Doctrine of March 12, 1947. Alternative starting points are 1945, when the Second World War left the United States and the Soviet Union facing each other over a divided Europe, and, for the conflict’s ideological roots, 1917.
When did the Cold War end?
The standard answer is December 1991, when the Soviet Union dissolved, with Gorbachev’s resignation on December 25 and the formal dissolution on December 26. Many historians treat November and December 1989, the fall of the Berlin Wall and the Malta Summit, as the effective end.
How long did the Cold War last?
On the standard dating, 44 years and 9 months, from March 1947 to December 1991. Counted from 1945, about 46 years; counted from the Bolshevik Revolution of 1917, the underlying ideological rivalry spans 74 years.
Why is it called the Cold War?
Because the two superpowers never fought directly. George Orwell put the phrase in print in October 1945, imagining rival states locked in a permanent “cold war”; Bernard Baruch used it in an April 1947 speech, and Walter Lippmann’s 1947 book The Cold War made it the standard term.
Did the Cold War ever turn hot?
Between the superpowers themselves, no. But the proxy wars fought under its umbrella were fully hot for their participants: the Korean War (1950 to 1953), the Vietnam War, and the Soviet war in Afghanistan (1979 to 1989) each killed very large numbers of soldiers and civilians. The Cuban Missile Crisis of October 1962 brought the superpowers closest to direct nuclear war without crossing into it.
Who won the Cold War?
In the usual formulation, the United States and its allies, because the Soviet Union collapsed and its bloc dissolved while the Western alliance endured. Historians debate how much credit belongs to Western policy, to internal Soviet decay, and to Gorbachev’s choices, and that debate about responsibility is as unsettled as the debate about dates.
Conclusion
When was the Cold War? The defensible single answer is 1947 to 1991: containment declared in the spring of 1947, the Soviet Union dissolved at Christmas 1991, 44 years and 9 months apart. But the debate around that answer is not noise around a fact; it is the history itself, compressed. A start in 1917 says the Cold War was about ideas. A start in 1945 says it was about power and the map the war left behind. A start in 1947 says it was about decisions, made in Washington and Moscow, to organize the world into camps. An end in 1989 says it closed when its central symbol fell; an end in 1991 says it closed when one of its two worlds did. Choose the dates that fit the question you are asking, and know what each choice claims.
Sources & references
- Encyclopaedia Britannica (britannica.com): "Cold War" article and historical chronology, covering the Truman Doctrine, containment, the proxy wars, and the Soviet dissolution.
- U.S. Department of State, Office of the Historian (history.state.gov): Milestones in the History of U.S. Foreign Relations, including the Long Telegram and containment, the Truman Doctrine of March 12, 1947, the Marshall Plan, and the end of the Cold War, 1989 to 1991.
- Harry S. Truman Library and Museum (trumanlibrary.gov): Text of Truman's address to Congress of March 12, 1947 (the Truman Doctrine), and records of the Potsdam Conference.
- George Orwell, "You and the Atomic Bomb," Tribune, October 19, 1945: the first modern use of "cold war" in print; with Orwell's Observer column of March 10, 1946.
- Library of Congress (loc.gov): Cold War primary source sets, including the text of Winston Churchill's "Sinews of Peace" address at Fulton, Missouri, March 5, 1946.
- Wilson Center, Cold War International History Project (wilsoncenter.org): Documents and scholarship on the origins debate, the Malta Summit of December 1989, and the dissolution of the Soviet Union in December 1991.
- U.S. National Archives (archives.gov): Records of the Berlin Airlift, NATO's founding, and the Korean War armistice of July 27, 1953.
