The outcome of the Congress of Vienna in 1815 was a reconfiguration of European alliances that aimed to restore stability after the Napoleonic Wars. The congress established a balance of power among major European states, such as Austria, Prussia, and Russia, to prevent future conflicts and maintain territorial integrity. It led to the formation of the Holy Alliance and initiated a period known as the Concert of Europe, which facilitated diplomatic cooperation. While the Congress maintained relative peace for decades, it also laid the groundwork for future nationalist movements and tensions that would later contribute to World War I.