Why was there tension in europe prior to ww1

Europe before 1914

Fear of Germany's growing strength encouraged Russia and France to enter into alliance in 1893. ... The new and unlikely friendship between these three powers heightened German fears of 'encirclement' and deepened the divide among the European powers. Imperial rifts worsened these divisions and tensions.

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The crisis which developed in the summer of 1914 was one of several that had erupted in Europe in the early twentieth century. International tensions had been mounting, but in every previous crisis a continental war had been avoided. The assassination of Franz Ferdinand stoked old tensions beyond the Balkans.

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