WW2 · EPILOGUE ·
Aftermath of WW2
Chapter 15 of The War Room — WW2, 1936–1945: “The World the War Made”
The postwar map was set largely by where armies stood in 1945: Soviet forces held much of Eastern Europe, Germany was split into occupation zones and Korea divided at the 38th parallel. About sixty million people died, and new institutions followed, including the United Nations, the Nuremberg trials and the Marshall Plan.
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The map above is the world of Europe, late 1945 — An iron curtain descends.
Every state on the map that year: The world in 1945 · Europe in 1945.
Part of IB History: The Second World War →
SHORT EXPLANATION
The victors had to make peace in a world their armies already occupied. Soviet forces held much of Eastern Europe, where Soviet-backed governments soon took power; parliamentary democracies developed in the Western occupation zones. Germany and Korea were divided along lines associated with the armies’ advance. The alliance against the Axis gave way to the Cold War.
About sixty million people had been killed, though estimates vary widely, and millions more had lost their homes. The war hastened the decline of European colonial empires and prompted efforts to prevent another catastrophe: the United Nations, war-crimes trials, early human-rights law, a US-led economic system and European integration. These efforts shaped the peace without guaranteeing an end to violence.
The full story
What could the victors agree to do with the countries their armies occupied? At Yalta and Potsdam, the former allies negotiated over a map on which power was already unevenly distributed. Soviet forces held much of Eastern Europe, and Western forces held the west. Agreements mattered, but an occupying power could influence how promises were enforced. Germany’s occupation zones later became two states; Korea was divided at the 38th parallel.
The allies also differed over what security required. Soviet leaders, remembering repeated invasions, wanted controlled states between themselves and a possible enemy. Western governments saw Soviet control over those countries as expansion. The same arrangement that offered Moscow protection restricted the freedom of Germany’s neighbors and deepened Western fears. The final map shows the beginning of this rivalry as well as the end of the fighting.
The scale of destruction made reconstruction urgent. About sixty million people died, although estimates vary by country and category; the Soviet Union lost about 27 million and China perhaps around 20 million. Survivors faced displacement, famine, ruined cities and redrawn borders. Across Asia and Africa, independence movements pressed claims against weakened European empires, hastening the decline of colonial rule, often through further war.
The new international arrangements addressed different parts of the catastrophe. The United Nations sought collective security, while the Nuremberg trials established individual responsibility for state crimes. The Genocide Convention and Universal Declaration of Human Rights set out standards for the treatment of people. Bretton Woods and the Marshall Plan supported economic recovery, and European integration began to place strategic industries under shared authority.
Each settlement also involved a choice with costs. The UN Security Council gave the great powers a veto to keep them in the system, but that power could paralyze action. American aid helped rebuild Western Europe while tying it to a US-led economy. Retaining the Japanese emperor eased the occupation but limited accountability at the top. Power, local movements, institutional design and memories of failure all shaped the results. The war’s end opened a new political struggle; it did not produce a finished peace.
FULL EXPLANATION
Armies as political facts
An army occupying a country can do more than hold a position on a map. It gives its government influence over borders, police, parties and institutions. At Yalta and Potsdam, negotiators had to work with that power already in place. The question was how the victorious states would use it. For Soviet leaders, two catastrophic invasions in thirty years made friendly or controlled states between Germany and the Soviet Union attractive as protection. Western leaders accepted some of those security concerns, yet increasingly saw the creation of one-party governments as expansion. Here was a security dilemma: measures presented as defense by one side appeared threatening to the other. Germany’s occupation zones hardened into separate states, while the hurried division of Korea created another lasting frontier. Occupation did not settle every question in May 1945. Elections, local communist and non-communist movements, economic recovery and later crises still mattered. They mattered within circumstances shaped by military power. The map therefore shows the resources with which governments bargained, as well as where their armies stopped.
Institutions and the unfinished peace
The architects of the postwar order had seen international rules fail to prevent catastrophe. They built institutions to answer different failures, but each depended in some way on the cooperation of states. The United Nations pursued universal membership while giving the great powers vetoes: strict equality was sacrificed in the hope that the strongest states would remain inside the system. At Nuremberg, leading Nazis were prosecuted and the idea of crimes against humanity was developed, although critics called the proceedings victors’ justice. Human-rights instruments established standards without automatic enforcement. Economic arrangements had political purposes too. Marshall Plan aid supported recovery and tied Western European economies to the United States. By pooling coal and steel, European countries placed industries essential to Franco-German war under shared authority. Elsewhere, colonial powers tried to restore their empires, and wars followed in Indonesia, Indochina and other places. Nuclear arms, proxy wars and later genocides coexisted with the promise of “never again.” The institutions changed law and expectations, but their standards could only have practical force when states were willing to apply them.
Key places on the map
On this day
Why it happened
Armies and the peace. The negotiators at Yalta and Potsdam did not begin with a blank map. Armies already occupied much of Europe, giving their governments the power to enforce some decisions and resist others. German occupation zones later became separate states, while the division at the 38th parallel became a lasting Korean frontier. The position of forces helps explain the settlement; governments’ subsequent choices show how that position was used.
Security through buffer. Twice in thirty years the USSR had suffered invasion through Poland, at a cost of tens of millions of lives. Soviet leaders wanted control over neighboring states between Germany and Moscow to guard against another attack. Western governments saw that control as expansion, while people in the buffer states lost political freedom. Fear of another invasion helped explain Soviet policy, but it did not make its consequences for those neighbors disappear.
The productivity superpower. The United States had resources few other powers could match after the war: approximately half the world’s industrial output, an intact major economy and the atomic bomb. The Bretton Woods arrangements of 1944 placed the dollar at the center of the international monetary system. American influence over the postwar economic and security order rested in large part on this combination of productive, financial and military power.
THE TURNING POINT
The handshake that became a border. On 25 April 1945, soldiers of the two victorious armies met at Torgau and posed on a damaged bridge. Their countries had fought together against Germany. Within three years the line separating their positions had become fortified, and in 1961, sixteen years after the meeting, a wall went up through Berlin. The photograph records a moment of alliance; the later frontier shows how far relations had changed.
What it changed
The long peace — under a mushroom cloud. Since 1945 there has been no direct great-power war. Historians debate how much deterrence, exhaustion, institutions and luck contributed to that peace. Its limits become clear when we look beyond the great powers’ direct relations. Wars continued in the decolonizing world, including Korea, Vietnam and Angola, where outside powers supported opposing sides. A peace between powerful states could coexist with devastating fighting elsewhere.
Never again — the unfinished project. The catastrophe of 1939–45 helped produce human-rights law, refugee conventions and efforts to prevent genocide. Those commitments established reasons to act, but they did not ensure action when people were threatened. Atrocities in Cambodia, Rwanda and Bosnia tested them, and prevention often failed. The record leaves a question about what governments and others will do when warnings come.
Your map, your questions. In Free Explore, scrub the timeline and click a country to follow its war. Poland was erased and shifted westward; Finland fought three wars; Yugoslavia saw resistance; Spain watched as a neutral country. Choose one and trace its changes across the map. Each path brings a different part of the wider conflict into view.
DISCUSSION QUESTION — Was the Second World War “one war”? Argue both sides using what you’ve seen on this map.
The case for separate wars begins with their different origins: the conflicts in China and Poland, Barbarossa and the Pacific war started at different times, involved different actors and had different aims. By December 1941, however, alliances, production, shipping and strategy connected the theaters. Lend-Lease and coordinated offensives made outcomes in one theater matter to others. Several conflicts had merged into one global system.
An interesting fact
Unexploded weapons keep the war present in the ground. German bomb-disposal services recover on the order of 2,000 tonnes of wartime ordnance each year, and discoveries still require evacuations. In December 2011, a falling Rhine exposed a 1.8-tonne British bomb at Koblenz; about 45,000 people, nearly half the city, left home while engineers defused it. The work remains dangerous. In 2010, three disposal technicians died at Göttingen while defusing a bomb dropped before any of them was born.
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