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Which of the following was the most significant long-term cause of the European Great War that began in 1914?


Border disputes between the French and Germans that had existed since the 1890s.


The competition for African colonies rich in natural resources (like South Africa) to support the nations' new industrial economies.


The sinking of British merchant ships by "lone wolf" German U-boats.


The expansion of German interests in the British-controlled Middle East.


The need to control vital waterways such as the English Channel, North Sea and Morrocan Strait.

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