The veto emerged from wartime talks among the Allied powers at Dumbarton Oaks, Yalta and San Francisco, and no single country invented it. Its scope was settled at Yalta in 1945.
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The EU grew from a 1951 coal and steel pact among six countries into a union formally created by the Maastricht Treaty, signed in 1992 and in force in 1993.
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The 1648 Peace ended the Thirty Years' War. Many scholars now reject the idea that it founded the sovereign state system, though some defend a qualified importance.
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