One major change in the world during the decades that followed World War II was the emergence of more than 50 new sovereign states. Essentially, this was the result of decolonization.

Before World War II the countries of western Europe had ruled, controlled, or powerfully influenced vast tracts of territory overseas. The main exceptions were Spain, which had long since lost its empire, and Germany, whose colonies had been confiscated after World War I. Otherwise, Belgium, Britain, France, Italy, the Netherlands, and Portugal remained imperial powers, holding direct or indirect sway over most of Southeast Asia, parts of the West Indies, nearly all of Africa, and much of the Middle East.

Gradually, what had once been colonies, protectorates, or client states won their independence. Some 800 million people were now responsible for their own affairs. Few were richer or more secure. Many retained links with Europe—linguistic, cultural, economic or commercial; many depended on European investment and aid. But they were free of their colonial masters. Painfully, and sometimes violently, the old order had been superseded, and new relationships had to be built.

The Italian colonies in North and East Africa, like the Japanese empire in East Asia, were dismantled fairly quickly. Independence likewise came early to various Middle Eastern countries, although for many years European influence there continued. Egypt had become formally independent in 1922, Iraq in 1932, and Lebanon and Syria in 1941. Iran’s independence was guaranteed by Britain and the U.S.S.R. in 1942. The year 1946 saw Jordan’s independence, and 1948 the proclamation of Israel. Historical ties (including the memory of Hitler’s Holocaust), strategic pressures, and the need for Middle Eastern oil kept Europe deeply involved in the area long after most of its countries’ formal independence had become much more real. The Suez expedition of 1956 actually brought down a British government; oil price rises in the 1970s caused a European recession; and Saddam Hussein’s invasion of Kuwait in 1990 for a time seemed to threaten the risk of world war.

British and Dutch decolonization in East Asia began in 1947 with the independence of India and the creation of Pakistan. Burma and Ceylon followed in 1948, and the Dutch East Indies in 1949. Malaya’s independence was delayed until 1957 by a communist campaign of terror, quelled by both a sophisticated antiguerrilla campaign and a serious effort to win what the British General Sir Gerald Templer called “the hearts and minds of the Malayan people.”

French decolonization proved more troublesome. France had given the name “Indo-China” to a million square miles in Southeast Asia, an area nearly 10 times the size of the mother country, which it had colonized in the 19th century—a union of settlements and dependencies in Tonkin, Annam, Laos, Cambodia, and Cochinchina around Saigon. As early as 1925, the Vietnam Revolutionary Party had been founded to fight for the unity and independence of Tonkin, Annam, and Cochinchina. In 1945 it proclaimed a democratic republic and fought the French for eight years. Following the French defeat at Dien Bien Phu in 1954, Vietnam became independent and was partitioned between Hanoi and Saigon. When communist North Vietnam began threatening and attacking the South, the United States was drawn into 10 years of unsuccessful and divisive hostilities, at a heavy cost in human life and political credibility.

France faced similar problems in North Africa. Morocco and Tunisia obtained independence in 1956, but Algeria, legally part of the French republic, aroused far fiercer passions and led to another eight-year war, from 1954 to 1962. Whereas Dien Bien Phu had brought down a French government, the Algerian War caused the downfall of the French Fourth Republic and the accession to power of de Gaulle, who had been in retirement (his second) since 1951. French settlers in Algeria cheered him when he told them: “I have understood you.” Only later did they realize that his understanding embraced the need to grant Algeria independence and to crush attempted coups on the part of the settlers’ right wing.

In sub-Saharan Africa, what Harold Macmillan called “the wind of change” blew less stormily. There were violent incidents and atrocities, as in the former Belgian Congo; and there were tribal and civil wars. Some white settlers hotly resisted decolonization, as in Rhodesia and South Africa. But by the 1990s only South Africa maintained white supremacy, and even there the apartheid system was dismantled by 1994. Europeans were aghast at Africa’s recurrent famines and concerned at the persistence of apartheid. Yet no aspect of Africa’s development seemed likely to affect Europe as deeply as Indochina and Algeria had affected France.

One feature of the postcolonial period, however, was the reflux into Europe of emigrants from the former colonies. Some, civil servants and business people, had little difficulty in settling themselves. Others faced latent racism. In Britain the first such immigrant groups, from the West Indies, were broadly welcomed. But between 1950 and 1957 Britain’s immigrant population doubled, to 200,000; and the busy diligence of Indian and Pakistani shopkeepers, though welcomed by many, also aroused envy and hostility, as it had in Uganda, whence some of them had fled. In France, too, there was racial hostility, directed more often against North Africans than against black immigrants. Neither France nor Britain seemed to have studied the careful preparations that the Netherlands had made to meet similar problems with immigrants from East Asia.

In eastern Europe there was also pressure for independence from quasi-colonial rule. Signs of unrest had begun in Poland, where in June and July 1956 strikes and riots in Poznań had ended with the deaths of 53 workers. In October of that year in Hungary, there was a full-scale revolt, finally quelled on November 4 by Soviet tanks. A similar fate ended the “Prague Spring” of 1968 in Czechoslovakia. For a long time, it seemed as if eastern Europe would never be free.

Yet there too the winds of change were blowing. The accession to power of Mikhail S. Gorbachev in 1985 marked a real turning point in the U.S.S.R.: glasnost (“openness”) replaced compulsive secrecy, and attempts at perestroika (“restructuring”) sought to replace with efficiency the dead hand of state control. Already in Poland the workers’ leader Lech Wałęsa had rallied supporters round the union banner of Solidarity; in Poland and elsewhere, as the 1980s ended, a new era began. Victims were rehabilitated; oppressive regimes were overthrown; dictators were executed; and free elections were held. For many, the most moving moment was on the night of November 9–10, 1989, when the Berlin Wall was breached. Erected by the East German authorities in 1961 to prevent their citizens from fleeing to the West, the Wall was a concrete symbol of the division of Berlin, of Germany, and of Europe. Less than a year later, on October 3, 1990, Germany and Berlin were both formally reunited. How long would it be before Europe was reunited too?