In 1871, following Prussia's victory in the Franco-Prussian War, Germany was first unified. The majority of the German-speaking nations in Europe came together during this unification to form the German Empire under the rule of Prussia.
Following the conclusion of the Cold War in 1990, a second unification took place. Germany was split between the west and east between 1945 and 1990.
Many Germans desired to live in a single country. However, Otto von Bismarck, who many historians believe started the Franco-Prussian War in order to unify Germany, was largely responsible for its eventual success.
After decades of nationalist backing and the approval of the majority of the German-speaking leaders in Europe, Germany was finally united.
The majority of the rulers of the German-speaking countries of Europe freely decided to join Prussia to create a single, undivided German state. Following Prussia's victory in the Franco-Prussian War, this was done.
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