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It started because Austria Hungary invaded provinces of Bosnia and Herzegovina, affecting Russian interests.
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On December 24th, in Ypres, Belgium, the German soldiers started to sing Christmas Carols and then the British soldiers started to sing too so for that moment they didn´t shoot and had a peaceful time.
https://earth.google.com/web/@50.8660349,2.87277504,6.81369513a,29349.59603987d,35y,-0h,0t,0r/data=CkoaSBJACiUweDQ3ZGNjZWZmNGMyMGUzZTc6MHg5OWYzMzViZWY0ODQzZjQwGcIyNnSzbElAIaodD8cEBgdAKgVZcHJlcxgCIAEoAg -
It finished because all armies were devastated.
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It occurred because of speculation, over production and uneven wealth distribution caused New York stock market crash.
https://earth.google.com/web/@40.7060006,-74.008801,4.11197997a,777.70005829d,35y,0h,45t,0r/data=CkwaShJCCiUweDg5YzI1YTE2NWJlZGNjYWI6MHgyY2IyZGRmMDAzYjVhZTAxGWr6RzpeWkRAIQPLETKQgFLAKgdXYWxsIFN0GAIgASgCKAI -
It started because Germany broke the " No agression" pact and invaded Poland.
https://earth.google.com/web/@51.95375055,19.1343786,125.94244345a,1833865.35329036d,35y,0h,0t,0r/data=CksaSRJBCiQweDQ3MDA5OTY0YTQ2NDBiYmI6MHg5NzU3M2NhNDljYzU1ZWEZjln2JLD1SUAh5ngFoiclM0AqB1BvbG9uaWEYAiABKAI -
Ideological fiht between the capitalist west and the socialist east.
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Creation of the United Nations High Commissioner for Refugees.
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Fidel Castro and Ernesto Che Guevara wanted to defeat Fulgencio Batista´s dictatorship.
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Six European countries gathered and created the European Union involvin economic aspects.
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The US and the Soviet Union focused in Vietnam so they divided it, but then Vietnam wanted to become one again so after the war they reunite.
https://earth.google.com/web/@15.79392525,105.9102078,253.77645955a,2863278.80639664d,35y,0h,0t,0r/data=CkwaShJCCiUweDMxMTU3YTRkNzM2YTFlNWY6MHhiMDNiYjBjOWUyZmU2MmJlGdAksaTcHSxAIfje36C9EVtAKgdWaWV0bmFtGAIgASgC -
It was built during the Cold War.
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A virus called AIDS was a big problem in the population in New York and San Francisco causing the death of around two million people around the world.
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With the fall of the wall the Cold War and the socialism ended.
https://earth.google.com/web/@51.17580575,10.45411935,231.90654991a,1865512.49153078d,35y,0h,0t,0r/data=Ck0aSxJDCiUweDQ3OWE3MjFlYzJiMWJlNmI6MHg3NWU4NWQ2YjhlOTFlNTViGeoe2Vw1lUlAIV-Wdmou5yRAKghBbGVtYW5pYRgCIAEoAg -
Nelson Mandela becomes the first black president of South Africa.
https://earth.google.com/web/@-25.7378285,28.2267422,1414.96102248a,940.40381599d,35y,0h,45t,0r/data=ClUaUxJLCiUweDFlOTU2MWU4Nzk0OTBiY2I6MHhjYzkwZWViMWRiNzlhOTU0GYaOHVTivDnAIYOf3cYLOjxAKhBNYWhsYW1iYSBOZGxvcGZ1GAIgASgCKAI -
The AI-Qaeda group organized a terrorist attack to the Twin Towers in New York City.
https://earth.google.com/web/@40.71304709,-74.01352933,322.63936067a,732.93164248d,35y,100.62553768h,44.9997159t,-0r/data=ClsaWRJRCiUweDg5YzI1YTE5N2MwNmI3Y2I6MHg0MGEwNmM3OGY3OWU1ZGU2GY55eCo7W0RAIfW7sDXbgFLAKhZPbmUgV29ybGQgVHJhZGUgQ2VudGVyGAIgASgC
