Answer: French revolution
Explanation: The Final Act, embodying all the separate treaties created at and around the Congress of Vienna, was signed on June 9, 1815, ushering in major territorial changes to Europe to create a balance of power between nations. France lost all of its territorial conquests from the Napoleonic Wars. The goal of the Congress of Vienna was not simply to restore old boundaries but to resize the main powers so they could balance each other and remain at peace. Despite the efforts of the Great Powers of Europe to prevent conflict and war with the Congress of Vienna, in many ways the Congress system failed by 1823. The rest of the 19th century was marked by more revolutionary fervor, more war, and the rise of nationalism. With the Concert of Europe, the territorial boundaries laid down at the Congress of Vienna were maintained, and even more importantly there was an acceptance of the theme of balance with no major aggression. Otherwise, the Congress system failed by 1823. In 1818 the British decided not to become involved in continental issues that did not directly affect them.
