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  The Empire of Japan's Kwantung Army invaded Manchuria on 18 September 1931, immediately following the Mukden Incident.
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   Czechoslovakia must surrender its border regions and defenses to Nazi Germany. Czechoslovakia must surrender its border regions and defenses to Nazi Germany.
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  Polish territory divided among Germany, Lithuania, the Soviet Union, and Slovakia Danzig annexed by Germany Kresy annexed by the Soviet Union.
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  Paris fell to Nazi Germany on June 14, 1940, one month after the German Wehrmacht stormed into France.
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  The Battle of Britain was a major air campaign fought largely over southern England in the summer and autumn of 1940.
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  On June 22, 1941, more than 3 million German and Axis troops invaded the Soviet Union along an 1,800-mile-long front, launching Operation Barbarossa.
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   On the morning of December 7, 1941, Japan attacked the US naval base at Pearl Harbor, Hawaii. On the morning of December 7, 1941, Japan attacked the US naval base at Pearl Harbor, Hawaii.
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   On the morning of June 4, 1942, aircraft from Japanese carriers attacked and damaged the US base on Midway. On the morning of June 4, 1942, aircraft from Japanese carriers attacked and damaged the US base on Midway.
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   Stalingrad was one of the most decisive battles on the Eastern Front in the Second World War. Stalingrad was one of the most decisive battles on the Eastern Front in the Second World War.
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   The Allied invasion of Italy was the Allied amphibious landing on mainland Italy that took place from 3 September 1943. The Allied invasion of Italy was the Allied amphibious landing on mainland Italy that took place from 3 September 1943.
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   The D-Day operation of June 6, 1944, brought together the land, air, and sea forces of the allied armies in what became known as the largest invasion force in human history. The D-Day operation of June 6, 1944, brought together the land, air, and sea forces of the allied armies in what became known as the largest invasion force in human history.
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   The Liberation of Paris was a military battle that took place during World War II from 19 August 1944 until the German garrison surrendered the French capital on 25 August 1944. The Liberation of Paris was a military battle that took place during World War II from 19 August 1944 until the German garrison surrendered the French capital on 25 August 1944.
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   It is a small island covering an area of about 8 square miles It is a small island covering an area of about 8 square miles
 and spanning about 5 miles.
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   Okinawa Prefecture is located in the southwestern tip of the Japanese archipelago. Okinawa Prefecture is located in the southwestern tip of the Japanese archipelago.
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   On Victory in Europe Day, or V-E Day, Germany unconditionally surrendered its military forces to the Allies, including the United States. On Victory in Europe Day, or V-E Day, Germany unconditionally surrendered its military forces to the Allies, including the United States.
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  The United States bombings of the Japanese cities of Hiroshima and Nagasaki on August 6 and August 9, 1945.
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  V-J Day, or Victory over Japan Day, marks the end of World War II, one of the deadliest and most destructive wars in history.
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  The Nuremberg trials were held by the Allies against representatives of the defeated Nazi Germany.