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The single major cause of WW I was the formation of two vast military alliances, the Central Powers and the Triple Entente, both of which were arrogant and unrealistic about their own capabilities. The incident which set off the war was the assassination of Archduke Franz Ferdinand of Austro-Hungary. The greatest issue dividing the two alliances was the ownership of the province of Alsace-Lorraine, claimed by both Germany and France.

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15y ago

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