The document summarizes the history and evolution of European integration from the early post-World War 2 treaties establishing the European Coal and Steel Community (ECSC) in 1951 and the European Economic Community (EEC) and Euratom in 1957. It then discusses subsequent treaties that deepened integration, including the Single European Act of 1986, the Maastricht Treaty which established the European Union in 1992, and the Lisbon Treaty of 2007. The Lisbon Treaty reformed the EU's institutions and consolidated earlier treaties into a single document to make the EU's legal framework clearer and more efficient.