|the concept, first established by Europeon nations after the final defeat of Napoleon, whereby alliances called the Concert of Europe required nations to assist each other in order to defeat any one nation that became too power and started invading others. | |the concept, first established by Europeon nations after the final defeat of Napoleon, whereby alliances called the Concert of Europe required nations to assist each other in order to defeat any one nation that became too power and started invading others. |