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Almost all countries were involved in WW1 . But everything started with the assassination on Franz Ferdinand. The assassin was Gavrilo Princip, member of Organization "Mlada Bosna". We can say that at the start the WW1 was between Kingdom of Yugoslavia and Austro-Hungarian Empire, but later, as I said in the first sentence, almost whole world was involved in WW1.
I hope I helped you.
Pardon my french :)

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15y ago

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