After the defeat of revolutionary France, the other great powers tried to restore the situation which existed before 1789. In 1815 at the Congress of Vienna, the major powers of Europe managed to produce a peaceful balance of power among the empires after the Napoleonic wars (despite the occurrence of internal revolutionary movements) under the Metternich system. However, their efforts were unable to stop the spread of revolutionary movements: the middle classes had been deeply influenced by the ideals of democracy of the French revolution, the Industrial Revolution brought important economical and social changes, the lower classes started to be influenced by socialist, communist and anarchistic ideas (especially those summarized by Karl Marx in The Communist Manifesto), and the preference of the new capitalists became Liberalism. Further instability came from the formation of several nationalist movements (in Germany, Italy, Poland, Hungary etc.), seeking national unification and/or liberation from foreign rule. As a result, the period between 1815 and 1871 saw a large number of revolutionary attempts and independence wars. Napoleon III, nephew of Napoleon I, returned from exile in the United Kingdom in 1848 to be elected to the French parliament, and then as "Prince President" in a coup d'état elected himself Emperor, a move approved later by a large majority of the French electorate. He helped in the unification of Italy by fighting the Austrian Empire and fought the Crimean War with the United Kingdom and the Ottoman Empire against Russia. His empire collapsed after an embarrassing defeat for France at the hands of Prussia in which he was captured. France then became a weak republic which refused to negotiate and was finished by Prussia in a few months. In Versailles, King Wilhelm I of Prussia was proclaimed Emperor of Germany, and modern Germany was born. Even though the revolutionaries were often defeated, most European states had become constitutional (rather than absolute) monarchies by 1871, and Germany and Italy had developed into nation states. The 19th century also saw the British Empire emerge as the world's first global power due in a large part to the Industrial Revolution and victory in the Napoleonic Wars.
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