The Congress of Vienna brought together the European Great Powers together immediately following Napoleon and France's defeat in 1914. The goal of the Congress was to restore order to the European Continent. The leaders of Britain, France, Russia, and Austria sought to do this through re-establishing the balance of power in Europe to prevent future conflict. Through this "congress" which was in fact a series of informal conversations between the countries leaders led to the establishment of numerous treaties between the Great Powers. As parts of these treaties there were also large territorial redistributions of land amongst the great powers.
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The event which started the Gulf War in 1991 was a) the invasion of Kuwait by Iraq. There were the largest amount of coalition forces during this war since World War II, with most of them being from the United States, the United Kingdom, Saudi Arabia and Egypt fighting for Iraq to immediately stop it's invasion and annexation of Kuwait.