Answer:
World War II
Explanation:
World War II devastated most of Europe. In particular, countries like Germany, France and Britain were greatly affected by the war.
European leaders did not want to repeat the same story. They met to discuss the alternatives to keep another war form happening. They decided that linking the European economies together was the most effective way to prevent war.
Six nations: The Netherlands, Belgium, Luxembourg, France, Germany and Italy, formed in 1952 the European Coal and Steel Community, the antecessor of the European Union.