World War Two!
World war Two was fought from 1939-1945.
The main cause of the war was Adolf Hitler.
Hitler was a brilliant motivator, inspiring the people of Germany to believe that they could rule the world entire.
Hitler also motivated nationwide antisemitism, causing the mass extermination of over 6 million innocent people.
These were the Jews, Gypsies, Homosexuals, and all other minorities.
Hitler's plans of world domination were ended when his 6th army was crushed by the Russians in Stalingrad, and when his armies to the west, were defeated by the Americans and the British.