Originally posted by: -Sharingan-Kakashi-
wwi was started because of crazed nationalism and imperialism
No, WWI was the direct result of a retarded alliance system that was used back then. Nationalism and imperialism was the cause of the conflicts, not the war. The conflict did not cause every western country to participate in a global war, the alliance system did. It should have just been a few European countries fighting.
wwii because germany got shitted on with the treaty of versailles and britain and france allowing them to build back up
No, that's only the root of the problem. It was Hitler who played the emotions of the German people, and they put him in power. Without Hitler there probably would not have been a war, since the Nazi party really wasn't anything without Hitler. WWII is a result of human emotions.

War's a complicated thing. All wars are started by conflicts, but not all conflicts turn into wars, especially world wars. The only thing preventing WW3 is nuclear weapons.