The History of the World · Grades 10–13 · College · University
The Cold War, 1945–1991: The Two-Camp World
History · Level band: Grades 10–13 · College · University
English edition — the language editions of the history classes are outstanding and will follow the site's translation pattern; none is fabricated here.
How to read this class
How to read this entry: DOCUMENTED = the fact stands in a named source — treaty texts, declassified records, the nations' own historians and commissions. DEBATED = a point the sources dispute, carried as a dispute. CLAIM = a figure or assertion carried at the weight its maker gives it, not the record's. Numbers the sources give differently are carried as ranges, flagged, never averaged into a false precision.
1. How the two camps formed, 1945–1949
DOCUMENTED. The Cold War began in the settlement of the Second World War. The wartime alliance of the United States, the Soviet Union and Britain had been an alliance against a common enemy, not an agreement about the world's future. In Europe, the Red Army's advance of 1944–45 left Soviet forces in possession of Eastern Europe; the Western Allies held the west. Germany was divided into occupation zones, and its capital, Berlin, was divided inside the Soviet zone. What followed was not a single decision but a hardening, dated step by step in the record.
DOCUMENTED — the steps. In March 1946 Winston Churchill, speaking at Fulton, Missouri, named an "iron curtain" descending across Europe — a speech, not a policy, but the phrase the era kept. On 12 March 1947 President Truman addressed Congress and stated the doctrine that carried his name: the United States would support peoples resisting subjugation — framed at the time around aid to Greece and Turkey, applied afterwards worldwide. In June 1947 Secretary of State George Marshall proposed American funding for Europe's recovery; the European Recovery Program — the Marshall Plan — followed in 1948, and the Soviet Union forbade its Eastern European satellites to take part. In June 1948 the Soviet Union blockaded the Western sectors of Berlin by land; the Western Allies supplied the city by air for eleven months until the blockade was lifted in May 1949. On 4 April 1949 the North Atlantic Treaty founded NATO. In May and October 1949 the two German states were proclaimed — the Federal Republic in the west, the German Democratic Republic in the east. Europe's division was now written in constitutions, armies and alliances.
DOCUMENTED. The Soviet answer came six years later and in kind: the Warsaw Treaty of 14 May 1955 bound the USSR and its Eastern European allies into the Warsaw Pact, a week after West Germany entered NATO. By then the pattern was set on both sides: two alliance systems, two German states, two economic orders, and — from August 1949, when the Soviet Union tested its first atomic bomb — two nuclear powers. The bipolar world the next forty years lived in was not natural and it was not ancient. It was built, in less than five years, out of the ruins of 1945.
DEBATED. Historians still dispute the weighting of causes — how far the division was driven by Soviet expansion, how far by American economic and strategic design, how far by the security fears of a Soviet state that had lost some 27 million dead to invasion from the west within living memory. The schools of that argument (orthodox, revisionist, post-revisionist) are named in the scholarship — Gaddis, Leffler, Westad — and this class carries the dispute as a dispute. What is not disputed is the sequence above, and its dates.
2. Containment, and the world it was applied to
DOCUMENTED. The American doctrine was containment: communism was to be held within its 1945–49 borders, by aid, alliances, covert action and, where Washington chose, war. The Soviet doctrine, in its own statements, was the defence of the socialist camp and support for "national liberation movements." Both doctrines were global, and both met a world that was simultaneously throwing off the European empires — India and Pakistan independent in 1947, Indonesia proclaimed in 1945 and recognised in 1949, Ghana in 1957, seventeen African nations in 1960 alone. The decolonising nations did not experience the Cold War as a chessboard. They experienced it as a second contest laid over their own struggle for independence — sometimes a source of arms and leverage, sometimes a catastrophe. Their record stands in the companion class, The Cold War World, at their own historians first.
DOCUMENTED. The two camps almost never fought each other directly. The exceptions that nearly became direct war were crises, not campaigns: Berlin in 1948–49 and again in 1961, when the Wall was built on 13 August 1961; and Cuba in October 1962, the nearest the world came to nuclear war, carried in full in the companion class. Everywhere else, the war between the camps was fought by proxy — in other people's countries, with other people's armies, and overwhelmingly with other people's dead. That pattern is the subject of §4, and it is the reason this set gives Korea and Vietnam whole classes of their own.
3. The arms race
DOCUMENTED. The United States held a nuclear monopoly from 1945 to 1949. The Soviet test of August 1949 ended it. Thermonuclear weapons followed — the United States in 1952, the Soviet Union in 1953 — and then the delivery race: long-range bombers, then intercontinental ballistic missiles (the Soviet R-7 flew in 1957; its launch of Sputnik the same year announced the capability to the world), then submarine-launched missiles, then multiple warheads on single missiles. Britain (1952), France (1960) and China (1964) became nuclear powers inside the period; the Non-Proliferation Treaty of 1968 attempted, with partial success, to stop the list there.
DOCUMENTED, figures as estimates. The historical stockpile estimates maintained by the Federation of American Scientists and the Natural Resources Defense Council put the world's nuclear arsenal at its peak in about 1986, at roughly 70,000 warheads — the great majority American and Soviet, with yields sufficient, in the strategic literature's own phrase, to destroy the world's cities many times over. The doctrine that governed the arsenals at their height was deterrence by assured destruction: each side held the other's population hostage, and called the hostage-holding peace. That the peace between the homelands held for forty-six years is DOCUMENTED. That it held because of the arsenals, rather than despite them, is DEBATED — the near-misses of 1962, of the 1973 Middle East war's alert, and of the autumn of 1983 (the Able Archer exercise and the false alarm of 26 September 1983, when Lieutenant Colonel Stanislav Petrov judged a Soviet early-warning alert to be false and did not pass it up as a launch warning) are the standing evidence that luck stood inside the system beside doctrine.
DOCUMENTED. Arms control was the arms race's own admission of danger: the Partial Test Ban Treaty of 1963 (after Cuba), the NPT of 1968, SALT I and the ABM Treaty of 1972, SALT II in 1979 (signed, never ratified, largely observed), and — after the renewed confrontation of the early 1980s — the INF Treaty of 1987, which abolished a whole class of missiles and was the first treaty to reduce, rather than cap, nuclear arms. The treaties' texts are the record; their verification regimes were the first institutional admission by both camps that neither trusted the other's word.
4. The proxy-war pattern
DOCUMENTED. The pattern repeated with variations for four decades. A local conflict — a divided country, a colonial war, a civil war — drew in one camp's money, advisers and arms; the other camp answered in kind; the local war's own causes (independence, land, nationhood, religion) were progressively subordinated, in outside reporting, to the camps' contest, while the dying remained local. Korea (1950–53) was the pattern's first full war and its bloodiest direct test: the one case where the camps' soldiers fought at scale under their own and allied flags, including Chinese armies in the field against American-led forces. Vietnam (carried in its own class) was the pattern's longest war. Afghanistan (1979–89) was the Soviet Union's. Angola, Ethiopia and the Horn, Nicaragua, El Salvador, Cambodia and Mozambique each carry their own forms of it.
DOCUMENTED, the accounting the pattern demands. The Cold War's death toll was not suffered in the two homelands. It was suffered in Korea (millions), in Vietnam, Laos and Cambodia (millions), in Afghanistan (a million and more), in Angola and Mozambique, in Central America, and in the internal repressions the camps armed and excused. A history that counts the Cold War as a "long peace" is counting only Europe and North America. This set counts whole.
5. The space race
DOCUMENTED. The competition in space was the arms race in public dress — the same rocketry, flown for prestige. The Soviet Union launched Sputnik 1, the first satellite, on 4 October 1957, and put the first human in orbit, Yuri Gagarin, on 12 April 1961. The United States answered with the Apollo programme and landed Apollo 11 on the Moon on 20 July 1969. Each side's records confirm the other's dates; the race is one of the period's best-documented sequences. Its military substance — reconnaissance satellites above all — made the later arms-control treaties verifiable, an outcome neither side advertised at the time. After 1975's joint Apollo–Soyuz flight, the race cooled into cooperation at exactly the pace the ground war of the camps allowed.
6. Thaw, freeze, thaw: 1953–1985
DOCUMENTED. The Cold War was never one temperature. Stalin's death in March 1953 and the Korean armistice that July opened the first thaw; Khrushchev's secret speech of February 1956 and the Hungarian rising crushed that November marked its limits — Soviet tanks in Budapest killed thousands of Hungarians (figures DEBATED by source; Hungarian and Western estimates range from c. 2,500 Hungarian dead upward) and the West did not intervene, a lesson in the camps' real borders that the decolonising world noted carefully. The 1960s brought Cuba's crisis and then the first treaties. The late 1960s and 1970s brought détente: SALT, the Helsinki Final Act of 1975 — whose human-rights provisions dissidents inside the Soviet bloc turned into an instrument their governments had not intended — and, in the same years, the camps' bloodiest proxy decade in Southeast Asia and Africa. Détente died in 1979–80, over the Soviet invasion of Afghanistan and the NATO missile deployments in Europe; the early 1980s were the coldest years since the 1950s.
7. The end, 1985–1991
DOCUMENTED. Mikhail Gorbachev came to power in the Soviet Union in March 1985 and attempted the system's reform — glasnost (openness) and perestroika (restructuring) — while seeking an exit from the arms race and from Afghanistan. The INF Treaty followed in 1987; the Afghan withdrawal completed in February 1989. In 1989 the Eastern European states left the Soviet camp in sequence — Poland's elections in June, Hungary's opened border, the Berlin Wall's fall on 9 November 1989, Czechoslovakia's Velvet Revolution, Romania's violent December — and Moscow did not send the tanks that 1956 and 1968 (Prague) had taught the world to expect. Germany reunified on 3 October 1990, inside NATO, by treaty. The Warsaw Pact dissolved in 1991. On 25 December 1991 Gorbachev resigned; on 26 December the Soviet Union declared itself dissolved. The Cold War ended not with a war between the camps but with one camp's internal collapse — the only great-power rivalry of the modern age to end so, and the fact that defines all argument about why.
DEBATED. Why it ended remains genuinely contested: the weight of the arms race's economic burden on the Soviet system; the reformer's choices and miscalculations; the Eastern Europeans' own agency in 1989; the price of oil; the Afghan war's drain; the legitimacy the system had lost at home long before. This class carries the end as DOCUMENTED in its dates and DEBATED in its causes, and warns against any single-cause telling — including triumphalist ones — that the archives opened since 1991 do not sustain in simple form.
8. The war that was everywhere else: intelligence, culture and fear
DOCUMENTED. The camps fought continuously below the threshold of war. Espionage was institutionalised on a scale without precedent — the CIA (founded 1947), the KGB (1954), and their allied services ran covert operations across every continent: the coups in Iran (1953) and Guatemala (1954), both DOCUMENTED from declassified American records, taught the decolonising world that a government could be removed without an invasion, and both are carried in the receiving nations' historiographies as founding wounds of the era. Defections, show trials, assassinations and propaganda — the Congress for Cultural Freedom on one side, the peace-movement fronts on the other, each partly funded by the intelligence service it denied serving — made culture itself a theatre of the contest. At home, both camps policed loyalty: McCarthyism and the House Un-American Activities Committee in the United States; the Soviet camp system and the psychiatric wards in the USSR. This class records the repressions of both camps at the same standard, because the archives of both sustain it.
DOCUMENTED. Fear was the era's civic weather. Civil-defence drills in American schools, fallout-shelter programmes, Soviet air-defence cities, the Doomsday Clock of the Bulletin of the Atomic Scientists — set at seven minutes to midnight in 1947 and at two minutes in 1953, the closest of the first Cold War — measure how the populations of the homelands understood their position: as hostages who were told the hostage-holding was safety. The literature of the era, from the spy novel to the Soviet dissident samizdat that circulated in typescript because print was forbidden, is part of the period's record and is read in the scholarship as such.
9. The two homelands: what the contest cost inside the camps
DOCUMENTED. The Soviet Union carried the arms race on an economy roughly half America's size; defence estimates for the USSR in the 1980s are DEBATED across a wide band (Western estimates of 12–17 per cent of GDP and higher, against a consumer economy in visible stagnation), but the direction of the burden is not disputed, and it belongs in any accounting of why 1985's leadership chose reform. The United States spent on its Cold War military establishment, across the whole period, a sum its own historians carry in the trillions of dollars, and fought its two Asian wars with a conscript army in the first case increasingly, in the second, to domestic crisis — the draft's abolition in 1973 is a direct institutional consequence of Vietnam. Neither homeland was invaded, bombed or occupied in forty-six years. The contrast with the proxy battlefields is the era's central moral fact, and this set is organised around it.
10. Periodisation: the dates this set uses
DOCUMENTED, with the debate noted. This class dates the Cold War 1945–1991: from the wartime alliance's collapse in the year of victory to the Soviet Union's dissolution. Other periodisations stand in the scholarship — 1947 (the Truman Doctrine) as the formal opening; 1989 (the Wall) as the effective end — and are carried here as DEBATED conveniences, not errors. The volume's own structure follows the long dating: Korea and Vietnam, Cuba and Afghanistan, all stand inside it, and the decolonisation that ran beneath it the whole way is given its own class rather than treated as the duel's backdrop.
11. The camps were never two solid blocks
DOCUMENTED. The two-camp map misleads if it is read as two monoliths. Yugoslavia broke with Moscow in 1948 and built its own road outside the Warsaw Pact. China and the Soviet Union — allies in 1950, when Chinese soldiers fought in Korea with Soviet equipment — split through the late 1950s over doctrine, leadership of the communist world and their border, and fought a brief border war on the Ussuri River in 1969; by 1972 Beijing was receiving an American president, and by 1979 China was at war with Soviet-backed Vietnam. Within the Western camp, France withdrew from NATO's integrated military command in 1966 and pursued its own nuclear force and its own diplomacy; the Suez crisis of 1956 split Washington from London and Paris in public. Albania changed camps twice. Romania defied Moscow on foreign policy while out-policing it at home. The camps were real — alliances, armies, doctrines, walls — but their edges were contested from the first year to the last, and the world's states learned to work the cracks. That working of the cracks, by Koreans, Vietnamese, Cubans, Afghans and the decolonising nations alike, is the connective subject of this volume's other three classes.
DOCUMENTED — the European exceptions. Twice the Soviet camp held its members by invasion: Hungary in November 1956 and Czechoslovakia in August 1968, the second invasion carried out by five Warsaw Pact armies against one of their own allies. Both invasions are documented in the invaders' and the invaded's records alike; the Prague Spring's suppression produced the Brezhnev Doctrine — the asserted right to intervene wherever socialism was judged threatened — which stood as the camp's constitution until Gorbachev renounced it in practice in 1989, when its non-use became the signal that the camp itself was ending. The Western camp's comparable internal disciplines were exercised by money, covert action and alliance politics rather than by tanks in allied capitals — a difference of method the record sustains, and a difference of kind it is the reader's work, on the evidence of this whole set, to weigh.
12. The Cold War in the chronology of this site
DOCUMENTED. This volume's entries stand in Era 7 of the site's Chronology (1945–2000), with the embargo's continuing record carried into Era 8. Read against the eras before it, the Cold War's place in the whole history is exact: it is the first age in which a single rivalry organised the politics of every continent at once, and the first in which the means existed to end the human story outright — means built, tested, deployed and, in the event, never used between the camps themselves, while being used in conventional form, without pause, against the peoples of the proxy battlefields. The classes that follow give those battlefields their own full record. The frame stands; the wars are the content.
DOCUMENTED — Korea and Vietnam in each other's shadow. The Korean precedent governed the American reading of Vietnam from the first: the fear of Chinese intervention capped the bombing's geography for years, the memory of rollback's price in 1950 disciplined Washington's refusal of a ground invasion of the North, and Hanoi and Beijing read the same precedent from the other side. China's aid to North Vietnam — engineering, anti-aircraft and logistics troops in the North numbering over 300,000 rotated through 1965–68 in Chinese official accounting released decades later — was itself bounded by the Korean lesson: support enough to prevent collapse, never the open field intervention of 1950. The two wars of this volume are one strategic conversation, and the chronology entries below place them so.
Sources
This class rests on the research file named in the Record line below: John Lewis Gaddis, The Cold War: A New History (2005) and We Now Know (1997); Odd Arne Westad, The Cold War: A World History (2017); Melvyn P. Leffler, For the Soul of Mankind (2007); the treaty texts (North Atlantic Treaty 1949; Warsaw Treaty 1955; Partial Test Ban Treaty 1963; Non-Proliferation Treaty 1968; SALT I and ABM Treaty 1972; Helsinki Final Act 1975; INF Treaty 1987); Federation of American Scientists / NRDC historical stockpile estimates. NOT VERIFIED items carried openly: no single agreed weighting of the Cold War's causes or of its ending exists in the scholarship, and none is printed here as settled.
Read beside this class
The Korean War, 1950–1953 · The Vietnam War · The Cold War World: Cuba, Afghanistan, and Decolonisation · They Signed On — The Long Service (Indigenous service in Korea and Vietnam stands there; it is not duplicated in this set) · Africa — The Continent
Record: this class rests on the research file THE_COLD_WAR_RESEARCH_2026-10-28.md in the Collection's study materials (world history), §1 and the NOT VERIFIED list.