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The Treaty of Versailles was signed to end World War I and left Germany in ruins, which left many Germans resentful

The League of Nations didn't address things done by both countries in it and not in it

While the war officially started in 1939, the Japanese attack on Pearl Harbor in 1941 caused the United States to join World War II, which changed the war significantly

https://www.worldhistory.org/article/2409/the-causes-of-wwii/

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About 70 nations took part in World War II

Fighting in World War II took place in Europe, Asia and Africa

The Allied Powers comprised of many different nations, but mostly the US, the UK, and the USSR, while the main Axis Powers were Germany, Italy and Japan

https://www.britannica.com/event/World-War-II

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The Battle of Stalingrad ranged from 1942-1943 and helped push Germany out of the USSR

The Battle of Normandy, or Operation Overlord, is most famous for its D-Day, when over a million troops stormed 5 different beaches on June 6, 1944

The Battle of Midway was a battle in the Pacific that went on from June 4-7, 1942, and helped turn the tide in the Pacific

https://www.history.com/topics/world-war-ii/world-war-ii-battles-timeline

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The war in Europe ended in 1945 after Adolf Hitler died and Germany surrendered, on what is known as V-E Day, or Victory in Europe Day

Japan continued fighting after Germany surrendered, although not for long, as they surrendered later in 1945

The US forced the surrender of Japan by dropping two atomic bombs on Hiroshima and Nagasaki, which killed between 150,000 to 246,000 people

https://www.loc.gov/classroom-materials/united-states-history-primary-source-timeline/great-depression-and-world-war-ii-1929-1945/world-war-ii/#:~:text=On%20May%208%2C%201945%2C%20Germany,War%20came%20to%20an%20end.

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World War II killed over 38 million civilians and about 15 million soldiers

Over 6 million Jews were killed in Europe by Nazis in concentration camps

Cities were decimated by the destruction brought from battles in WWII

https://www.imf.org/external/np/exr/center/mm/eng/mm_dr_01.htm#:~:text=The%20Most%20Destructive%20War%20in,both%20military%20and%20civilian%20lives.