The first world war broke out on 28th July, 1914 and lasted until 11th November, 1918. One of the reasons of the first world war is the assassination of Arch Duke Francis Ferdinand by a Serbian irredentist.

The second world war broke out on 1st September, 1939 till 2nd September, 1945 (6 years and 1 day). Reasons : 1. Rise of Italian fascism and 2. Japanese attack on Pearl Harbour on 7th December, 1941.

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WORLD WAR 1.the main provocation for world war 1 was murder of Franz fer dona nd of Austria by a serbian fanatic on 28th June 1914.the causes are aggressive nationalism,secret alliances,economic rivalry, imperialism,Germany challenge to British domination,French desire for r evangelical, militarism,balkanization politics, WORLD WAR 2.the immediate provocation was Germany tanks driving into Poland on September 1 1939.the causes are humiliating terms of treaty of versa ills,the failure of league of nations.german challenge to vengeful domination.the fear of socialism and USSR.