World War IIWorld War II or the Second World War, often abbreviated as WWII or WW2, was a global conflict lasting from 1939 to 1945. The vast majority of the world's countries, including all of the great powers, fought as part of two opposing military alliances: the Allies and the Axis. Many participants threw their economic, industrial, and scientific capabilities behind this total war, blurring the distinction between civilian and military resources.
Operation BarbarossaOperation Barbarossa (Unternehmen Barbarossa; Operatsiya Barbarossa) was the invasion of the Soviet Union by Nazi Germany and many of its Axis allies, starting on Sunday, 22 June 1941, during the Second World War. It was the largest land offensive in human history, with around 10 million combatants taking part. The operation, code-named after Frederick Barbarossa ("red beard"), a 12th-century Holy Roman emperor, Crusader, and German king, put into action Nazi Germany's ideological goal of conquering the western Soviet Union to repopulate it with Germans.
Joseph Stalin'Joseph Vissarionovich Stalin' (born Ioseb Besarionis dze Jughashvili; – 5 March 1953) was a Soviet politician, political theorist, and revolutionary who led the Soviet Union from 1924 until his death in 1953, ruling as a dictator after consolidating power in the late 1920s. He served as General Secretary of the Communist Party of the Soviet Union from 1922 to 1952, and Chairman of the Council of Ministers from 1941 to 1953. Ideologically adhering to the Leninist interpretation of Marxism, Stalin formalised the state ideology of Marxism–Leninism, while his policies are called Stalinism.
Nazi GermanyNazi Germany (officially known as the German Reich 1933–43, later the Greater German Reich 1943–45) was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a dictatorship. Under Hitler's rule, Germany quickly became a totalitarian state where many aspects of life were controlled by the government. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918).
WehrmachtThe Wehrmacht (ˈveːɐ̯maxt, defence force) were the unified armed forces of Nazi Germany from 1935 to 1945. It consisted of the Heer (army), the Kriegsmarine (navy) and the Luftwaffe (air force). The designation "Wehrmacht" replaced the previously used term Reichswehr and was the manifestation of the Nazi regime's efforts to rearm Germany to a greater extent than the Treaty of Versailles permitted.
Adolf HitlerAdolf Hitler (ˈaːdɔlf ˈhɪtlɐ; 20 April 1889 - 30 April 1945) was an Austrian-born German politician who was the dictator of Germany from 1933 until his suicide in 1945. He rose to power as the leader of the Nazi Party, becoming the chancellor in 1933 and then taking the title of Führer und Reichskanzler in 1934. During his dictatorship, he initiated World War II in Europe by invading Poland on 1 September 1939. He was closely involved in military operations throughout the war and was central to the perpetration of the Holocaust, the genocide of about six million Jews and millions of other victims.
Allies of World War IIThe Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during the Second World War (1939–1945) to oppose the Axis powers, led by Nazi Germany, the Empire of Japan, and the Kingdom of Italy. Its principal members by the end of 1941 were the United Kingdom, United States, Soviet Union, and China. Membership in the Allies varied during the course of the war. When the conflict broke out on 1 September 1939, the Allied coalition consisted of the United Kingdom, France, and Poland, as well as their respective dependencies, such as British India.
Soviet UnionThe Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national republics; in practice, both its government and its economy were highly centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian SFSR.
Red ArmyThe Workers' and Peasants' Red Army, often shortened to the Red Army, was the army and air force of the Bolshevik Party, Russian Soviet Federative Socialist Republic and, after 1922, the Union of Soviet Socialist Republics. The army was established in January 1918. The Bolsheviks raised an army to oppose the military confederations (especially the various groups collectively known as the White Army) of their adversaries during the Russian Civil War.
Axis powersThe Axis powers, originally called the Rome–Berlin Axis, was a military coalition that initiated World War II and fought against the Allies. Its principal members were Nazi Germany, the Kingdom of Italy, and the Empire of Japan. Alongside Italy, Romania and Hungary may also be considered among "the Reich's main allies". The Axis were united in their far-right positions and general opposition to the Allies, but otherwise lacked comparable coordination and ideological cohesion.