How did alliances contribute to the start of World War I? Alliances made it easier for nations to negotiate peace treaties.

Because of alliances, fewer nations needed to participate in the war.

Alliances required nations to defend each other against aggression

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the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.