the second Archduke Franz Ferdinand of Austria was shot, world war 1 officialy startes as the alies and the axis began to oppose each other. A bosnian rebel group called the black hand killed him. they tried many ways but eventually jumped onto his car and shot him dead. The assasin was arrested and i can't remember if he died in jail or not. hope this helps.
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3 September 1939: France and Britain declared war on Germany
The causes of World War I, which began in central Europe in late July 1914, included intertwined factors, such as the conflicts and hostility of the four decades leading up to the war.
The US entered World War 2 after the Japanese attack on Pearl Harbour on 7 December 1941 and got out after the official surrender of Japan on 2 September 1945.
Ottoman Empire
September 1, 1939 was the official beginning of World War 2.