Answer :
When Germany defied French neutrality, England entered the war. As a result, on August 2, 1914, Germany demanded that France remain neutral and indicated that it would declare war if France refused.
The Germans believed that France would remain neutral in the event of a conflict with Russia, but the Schlieffen Plan required a quick victory in the West to enable the German army to shift its focus to the East. The French government, which had pledged to uphold its treaty commitments to Russia, responded with a categorical refusal. As a result, on August 4, 1914, Germany declared war on France and invaded Belgium as part of the Schlieffen Plan. Germany's invasion of Belgium, which violated Belgian neutrality, provoked British involvement in the conflict.
The German government ignored Britain's diplomatic protest, and on August 4, Britain declared war on Germany. The First World War had now become a global conflict.
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