1940s:
* Nazi Germany invades Denmark, Norway, Benelux, France, and the Soviet Union from 1940-1941.
* Under Stalin's leadership, the Soviet Union played a decisive role in the defeat of Nazi Germany in the Second World War (1941-45) and went on to achieve the status of superpower. His crash programs of industrialization and collectivization in the 1930s, along with his ongoing campaigns of political repression, are estimated to have cost the lives of up to 20 million people.
* Stalin vastly increased the scope and power of the state's secret police and intelligence agencies. Under his guiding hand, Soviet intelligence forces began to set up intelligence networks in most of the major nations of the world, including Germany (the famous Rote Kappelle spy ring), Great Britain, France, Japan, and the United States. Stalin saw no difference between espionage, communist political propaganda actions, and state-sanctioned violence, and he began to integrate all of these activities within the NKVD. Stalin made considerable use of the Communist International movement in order to infiltrate agents and to ensure that foreign Communist parties remained pro-Soviet and pro-Stalin. One of the best early examples of Stalin's ability to integrate secret police and foreign espionage came in 1940, when he gave approval to the secret police to have Leon Trotsky assassinated in Mexico.
* Shortly before, during and immediately after World War II, Stalin conducted a series of deportations on a huge scale which profoundly affected the ethnic map of the Soviet Union. It is estimated that between 1941 and 1949 nearly 3.3 million were deported to Siberia and the Central Asian republics. Separatism, resistance to Soviet rule and collaboration with the invading Germans were cited as the official reasons for the deportations. During Stalin's rule the following ethnic groups were deported completely or partially: Ukrainians, Poles, Koreans, Volga Germans, Crimean Tatars, Kalmyks, Chechens, Ingush, Balkars, Karachays, Meskhetian Turks, Finns, Bulgarians, Greeks, Armenians, Latvians, Lithuanians, Estonians, and Jews. Large numbers of Kulaks, regardless of their nationality, were resettled to Siberia and Central Asia. Deportations took place in appalling conditions, often by cattle truck, and hundreds of thousands of deportees died en route. Those who survived were forced to work without pay in the labour camps. Many of the deportees died of hunger or other conditions.
* The United States enter World War II after the attack on Pearl Harbor on December 7, 1941.
* Germany and Japan suffer defeats at Stalingrad, El Alamein, and Midway in 1942 and 1943.
* D-Day (June 6, 1944).
* Germany surrenders May 7, 1945.
* Atomic bombings of Hiroshima and Nagasaki (August 6 and August 9, 1945); Japan surrenders on August 15.
* World War II officially ends on September 2, 1945.
* The Holocaust is the term generally used to describe the killing of approximately six million European Jews during World War II, as part of a program of deliberate extermination planned and executed by the National Socialist regime in Germany led by Adolf Hitler. Other groups were persecuted and killed by the regime, including the Roma, Soviet POWs, disabled people, gay men, Jehovah's Witnesses, Catholic Poles, and political prisoners. Taking into account all the victims of Nazi persecution, the death toll rises considerably: estimates generally place the total number of victims at nine to eleven million.
* United Nations established in 1945.
* In 1946, former British PM Winston S. Churchill gives his famous "Iron Curtain" speech with US President Harry S Truman present.
* Beginning of the Cold War (generally thought of as somewhere from 1946-1949)
* Independence for some former colonies (including India and Pakistan in 1947, Israel in 1948, and Indonesia in 1949).
* 1948 Arab-Israeli War.
* The Irish Free State becomes a republic in 1948.
* NATO founded in 1949.
* The Chinese Civil War ends in victory for the Communists in 1949. The Nationalists government retreat to Taiwan.
* The Berlin blockade in 1948.
* Informbiro period in Yugoslavia begins.
* Truman Doctrine is created.
* Soviets test their first nuclear bomb in 1949 (Soviet atomic bomb project). This is seen by some as the beginning of the Cold War.
1950s:
* Most of the countries of the Middle East continued in the national divisions created by their former European occupiers. However, with the growing importance of their abundance of oil, the otherwise mostly impoverished states experienced an increase of wealth to mostly the elite aristocratic or later theocratic regimes.
* The growth of the state of Israel continued.
* Mahmoud Abbas became involved in Palestinian politics in Qatar.
* In 1958 American troops entered Lebanon to restore order.
* Decolonization was occurring in Africa in the 1950s. In 1956 Sudan, Tunisia, and Morocco became independent. In 1954 guerrillas started the Algerian War of Independence. France continued its occupation and extensively used torture and death squads in an attempt to win the war. They were later forced out, but not until after training through example some of the most skilled torturers of the late 20th century.
* The Mau Mau began their terrorist attacks against the British in Kenya. This led to concentration camps in Kenya, the retreat of the British, and the election of former terrorist Kenyatta as leader of Kenya.
* Africa experienced the beginning of large-scale top-down economic interventions in the 1950s that failed to cause improvement and led to charitable exhaustion by the West as the century went on. The widespread corruption was not dealt with and war, disease, and famine continue to be constant problems in this region.
* The nations of the People's Republic of China and Indonesia began their history after their establishment in the late 1940s. Mao Tse-Tung began to rise in prominence in China as he helped lead a revolution against the Nationalist government. In 1953 the French occupiers of Indochina tried to contain a growing communist insurgency against their rule led by Ho Chi Minh. After their defeat at Dien Bien Phu in 1954 they were forced to cede independence the nations of Cambodia, Laos and Vietnam. Vietnam however was divided between the communist north and American-influence south, and conflict continued. By 1953 the three-year war between North Korea, supported by Russia, and South Korea, supported by the United States, had ended. This war resulted in a permanent border between the north and south sections of this country.
* After World War II the United States occupied Japan and assisted in its rebuilding. Social changes took place, including a move toward democratic elections, universal suffrage, emphasis on rebuilding of industry, as well as a fairly secure lifetime employment.
* In the 1950s Latin America was the center of covert and overt conflict between the CIA and the KGB. Their varying collusion with national, populist, and elitist interests destabilized the region. However, the intervention of the CIA allowed future exploitation of South American mineral and natural resources with no or minimal repayment to the general population. The United States CIA orchestrated the overthrow of the Guatemalan government in 1952. In 1957 the military dictatorship of Venezuela was overthrown. This continued a pattern of regional revolution and warfare making extensive use of ground forces.
* Post-war reconstruction succeeded, thanks to mostly non-corrupt implementation of the Marshall Plan. Europe continued to be divided into free and Soviet bloc countries. The geographical point of this division came to be called the Iron Curtain. It divided Germany into East and West Germany. In 1955 West Germany joined NATO. This alliance was formed out of fear to defend against a theoretical Russian ground invasion that never took place. The leaders of East Germany were equally afraid of this. In 1956 Soviet troops marched into Hungary.
* In 1957 the Treaty of Rome was part of the beginning of the process that led to the European Union. This union from the beginning was based on regulation and trade, and the weakness of basing a union on mercantile principles was not seen until into the 21st century.
* The Soviet Union continued its domination of the territories it conquered during World War II. Life was economically harsh and persecution of native religions intense. In 1953 Joseph Stalin, the leader of the Soviet Union, died and in the resulting power struggle head of the KGB Lavrenti Beria was denounced and executed. This enabled the future leadership of Russia to scapegoat them for the problems caused by the Communist Revolution. Popular rebellions in East Germany in 1953 and Hungary in 1956 were brutally put down.
* The United States, thanks to the GI Bill, low-entry-cost housing, and a booming economy, experienced a cultural shift as people acquired spacious housing, kitchens, and washing technologies that gave a higher quality of life. The Salk polio vaccine was introduced to the general public in 1955.
* Castro first attracted attention in Cuban political life through nationalist critiques of Batista and the United States political and corporate influence in Cuba. He gained an ardent, but limited, following and also drew the attention of the authorities. He eventually led the failed 1953 attack on the Moncada Barracks, after which he was captured, tried, incarcerated and later released. He then travelled to Mexico to organize and train for the guerrilla invasion of Cuba that took place in December 1956. Castro led the revolution overthrowing dictator Fulgencio Batista in 1959.