there was a war because the Austro-Hungarian Archduke was assassinated in Sarajevo and that is what brought Austro-Hungary into a war against Serbia, which caused a domino effect that brought the world to fight against one another.
Nationalism, military alliances, competitioin for colonies, and secret diplomacy were the four cause of the war. The assassination was the dynamite, that ignited the powder keg.
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I think the austo-Hungarian government overreacted i mean sure Serbia killed there archduke but theres no reason to start a war over i..........gosh!
In world war 1,germany started the war,but in world war 2,japan started it and usa ended the war
THE GREAT WAR WAS WORLD WAR 1
World War I World War II Afganistan War(After 2001) Plus many small wars in its country
The war after world war 2 in which Australia participated was the Korean war.
there is none. the longest war in world war 1 is world war 1. it would have to be the longest battle. :)*