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The Holocaust was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. -
This move was unpopular with many Germans who supported Hitler but resented the fact that Poland had received the former German provinces of West Prussia, Poznan (Poznań), and Upper Silesia after World War I under the Treaty of Versailles. -
The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force and the Fleet Air Arm of the Royal Navy defended the United Kingdom against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It was the first major military campaign fought entirely by air forces. -
Operation 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 over 10 million combatants taking part. -
The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the U.S. naval base at Pearl Harbor in Honolulu, Hawaii, just before 8:00 a.m. on Sunday, December 7, 1941.