This document discusses whether the European Union exhibits characteristics of a federal system and the extent to which the Lisbon Treaty moved the EU in a more federal direction. It analyzes several features of federal systems and compares them to the EU, such as a single currency (euro), common defense, written constitution, and supremacy of EU law. While the EU shares some federal characteristics like a single market and currency for some members, it lacks a full federal system with centralized taxation, military, and constitution. The document concludes the EU has moved in a more federal direction with reforms like the Lisbon Treaty but member states still retain significant sovereignty and control over most policy areas.