Answer :
The Congress of Vienna was an assembly that, in 1814–1815, reorganized Europe following the Napoleonic Wars. The "Final Act" was finished in June 1815 was the broadest treaty that had signed in Europe.
The Treaty of Chaumont, signed on March 9, 1814, a month before Congress of Vienna Napoleon's first abdication, established a special alliance between Austria, Prussia, Russia, and Great Britain, the four Europe nations that played a major role in the removal of Napoleon. All former belligerents were required to send plenipotentiaries to a congress in Vienna as part of the subsequent treaties of peace with France, which were signed on May 30 , just before the Battle of Waterloo and Napoleon's final defeat, starting in September 1814, five months after Napoleon I's first abdication.
The agreement was the broadest treaty that had ever been signed in Europe Congress of Vienna Europe by the "four" as well as Sweden, Portugal, and Spain, and on July 20 by Spain. The "four" nevertheless intended to keep the actual decision-making to themselves.
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