All of these men served as heads of the Communist party and/or Soviet government except for Leon Trotsky. Trotsky came to power in the same wave of revolution that ushered in Vladimir Lenin as leader of the country. However, Trotsky opposed the rise of Josef Stalin, and once Stalin assumed control of the country, Trotsky was exiled and a decade later, executed on Stalin's orders.

In the 1980s, the Soviet Union was suffering from a series of agricultural and industrial failures, and its economy was in a shambolic state. In an attempt to allieviate some of the ills of society and provide a more open state, the Communist party leader Mikhail Gorbachev promoted a series of reforms called "glasnost" and "perestroika." They were designed to open up individual freedoms and promote democracy in the country.

The Cuban Missile Crisis took place in 1963. The President of the United States at the time was John F. Kennedy and the leader of the Soviet Union was Nikita Kruschev. The crisis began when the Soviet Union installed missiles in Cuba very close to American territory. For a short time, the world was very close to nuclear warfare between the two countries until Kruschev and the Russians agreed to remove their missiles from Cuba if the United States removed its missiles from Turkey.

尤里加加林是苏联宇航员和第一human to go to outer space. During the 1950s and 1960s, a major part of the Cold War between America and the Soviet Union was the Space Race. The Soviets were the first to orbit the Earth (with Sputnik) and the first to put a man in space, Yuri Gagarin in 1961; however, the United States was the first to put a man on the moon in 1969.

The Yalta and Potsdam Conferences took place during and immediately after the Second World War, respectively. The three major Allied powers—Britain, the United States, and the USSR—met to discuss terms and the postwar world order. The Soviet Union was represented by Josef Stalin, who ruled the country at the time.

The Great Purge took place from the mid-1930s until 1940. It was an enforced program of political repression and was an attempt to consolidate power and control under Josef Stalin. Stalin ordered the Red Army purged of any subversive (or suspected subversive) elements, as well as the bullying and execution of millions of peasants.

The notion of a Five Year Plan is part of the Communist approach to controlled economies. During the history of the Soviet Union, the function of most five year plans was to either increase food production or to greatly improve industry and manufacturing. The first Five Year Plan was suggested by Stalin in the 1920s when he was still the General Secretary under Lenin. When Stalin assumed complete control of the party, he envisioned a system of collective farming across the nation and set up a Five Year Plan to engender this. It failed, somewhat spectacularly, and lead to grossly widespread famine and malnutrition.

In demanding an immediate transition to socialism for Russia, Lenin disagreed with Marx's views. Lenin also promoted the collectivization of farms, although at a more gradual rate than some of his peers.

Lenin advocated revolution from above, by trained revolutionaries.

射电望远镜dimir Lenin implemented the New Economic Policy in 1921, to help stimulate the Soviet economy following the Russian Civil War. Josef Stalin abolished this policy when he took power in 1928, favoring much more rigid state control of the economy. Nikita Khrushchev kept much of this rigid state control in place. Mikhail Gorbachev launched economic reforms to liberalize the Soviet economy in the 1980s, but these reforms were not known as the New Economic Policy.