During World War I the United States purchased the Virgin Islands from Denmark (1917), but it acquired no new colonies thereafter. In the 1920s the United States agreed to leave unfortified its possessions beyond Hawaii, in exchange for Japan’s accepting naval limitations. The Philippines, by the Tydings-McDuffie Act of 1934, were to become independent on July 4, 1946. Until U.S.-Japanese relations began to worsen, in 1939, U.S. possessions in the Pacific counted for little in world affairs. On the other hand, the United States established or continued virtual protectorates in Cuba, Haiti, the Dominican Republic, Nicaragua, and Panama during the Harding and Coolidge administrations (1921–29), a trend reversed under Hoover and Roosevelt, particularly under the latter’s Good Neighbor Policy toward Latin America.

The new Soviet Russian regime succeeded, after years of civil and foreign war, in regaining the Asian possessions of its tsarist predecessor. The Caucasus was repossessed step by step between 1919 and 1921; after the mountain areas and Azerbaijan were brought back under Soviet control, Armenia was partitioned between Russia and Turkey. Then Georgia, an independent parliamentary republic, was overrun by the Red Army. Russian Turkistan was subdued by 1922, and the khanates of Khiva and Bukhara were suppressed. By 1922, Outer Mongolia was also solidly linked to the Soviet state. Nevertheless, the Russian revolutionary government was ideologically opposed to colonialism, especially where it had no colonial interests that it cared to defend. In general, the Soviet authorities hesitated during the interwar period between the alternatives of backing liberation movements of “national bourgeoisies” and supporting peasant revolutionary parties.

In Central Asia the Soviet authorities followed a moderate line up to 1928, but with the advent of Stalin a new policy, consisting in purges of national leaders, increasing industrialization, and forced settlement of nomad populations, led to a great increase in the proportion of European settlers, mostly Russians and Ukrainians, to native Muslims. During the 1930s the Kazaks declined sharply in absolute numbers as well as in ratio to the Europeans in their areas. Other Muslim nationalities, especially the Uzbeks, stemmed the Slavic tide of settlement only by virtue of their birth rates, which greatly exceeded those of the Russians and Ukrainians.

Asia

Japan conquered its Greater East Asia Co-prosperity Sphere and arrived at the gates of India, displacing British, Dutch, and French colonial rulers as well as the Americans in Guam and the Philippines. The Japanese had to allow some margin of freedom to their satellite regimes in Burma and Indonesia in both of which preexisting local parties proved capable of creating sovereign states after the war. On August 17, 1945, Sukarno declared Indonesia independent. Indonesia had had a long history of Muslim, nationalist, and Communist agitation against the Dutch; with captured Japanese arms, Indonesia could resist reimposition of Dutch authority.

In India the Congress Party, though totally unsympathetic to the Axis, tried to take advantage of Britain’s wartime extremity in order to secure immediate independence. The Muslim League supported the British administration during the war but demanded a sovereign Muslim homeland (Pakistan) as a postwar objective. By 1945 direct British rule in India was coming to an end, but the contest between Britain, the Congress Party, and the Muslim League clouded any final settlement.

Middle East

In the Middle East, Britain returned to forms of direct colonial control as Axis forces drew near, and in June–July 1941 it occupied Syria and Lebanon, under the guise of Free French administration. With Beirut and Damascus secured, the British supported Syrian and Lebanese independence from France; the two states were incorporated into the sterling area. Only U.S. and Soviet support guaranteed the independence of the two republics (1944) and their subsequent admission to the United Nations.

In Egypt, when Axis forces in 1941 and 1942 came within striking distance of Alexandria, both the king, Farouk, and groups of dissident army officers were ready to welcome them and turn against the British. In February 1942 the British minister forced the king to appoint a government willing to cooperate with the Anglo-Americans; the defeat of the Germans in the Egyptian desert later that year put Egypt firmly in the Allied camp. Nevertheless much anti-British and anticolonial bitterness remained in Egypt, with postwar consequences.

At the outset of World War II Iran was pro-German, and in August 1941 the Soviet Union and Britain jointly occupied the country, which then became the main supply line connecting the Soviet Union with the Western Allies. In 1942, in a three-power treaty, both Britain and the Soviet Union promised to leave Iran six months after the end of the war. Notwithstanding such commitments, the Soviet Union began to build spheres of influence in northern Iran; in 1944 the Soviet Union brought pressure to bear on Iran for an oil concession.

During the final years of World War II the United States became vitally interested in the Middle East because of United States petroleum ventures in Saudi Arabia and because of strategic considerations. By the end of the war it was clear to both the Soviet Union and Britain that the United States, as a world power, would support no imposition of direct colonial controls in the postwar Middle East.

Africa

During World War II Italy lost its entire colonial domain. Ethiopia was restored as an independent empire, and the other colonies eventually came under UN jurisdiction, in the first step toward decolonization in the African continent.