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The countries involved in world war one were Britain, France, Russia, Germany, Austria-Hungary and Italy... these were split into the alliance system. Germany, Italy and Austria-Hungry made up the Triple Alliance and Britain, Russia, and France made the Triple Entente. This ensured that should one country fall into war the others would help.

So when the heir to the Austria-Hungry throne is killed by a Serbian the others are automatically forced to help defend the countries.

other reasons for the war were that Kaiser Wilhelm the King of Germany was extremely unstable and was jealous of Britains Empire he wanted to start a war.

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13y ago

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