The extension of the war beyond the end of 1914 resulted from B. Belgian resistance to the Schlieffen Plan.
What was the Schlieffen Plan?
The Schlieffen Plan was a strategic German military maneuver to sweep France and Belgium to frustrate Russia from coordinating an allied attack. Described as a strategy for victory, the plan was largely frustrated, thereby infuriating the Germans to device more plans to prosecute a decisive offence.
Thus, Belgian resistance to the Schlieffen Plan was responsible for extending the war beyond the end of 1914.
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