Here are some of the resources on EU constitutional law and treaties available through the UIUC Library system. Search the catalog for additional resources.
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All European Union law is derived from the treaties between the EU Member States. The treaties function as the EU's de facto constitution, defining both the allocation of powers between the EU and the Member States and the allocation of powers among the EU's institutions. The EU may act only with respect the "competences" (policy areas) granted to it by the treaties. The treaties cannot be amended without the consent of the Member States.
The two principal treaties on which the EU is based are now known as the Treaty on the European Union (TEU) and the Treaty on the Functioning of the European Union (TFEU). Both treaties have been amended repeatedly since they originally came into force, most recently by the Treaty of Lisbon in 2009.
The EU has compiled a consolidated version of its foundational treaties, encompassing both the TEU and the TFEU in their current, amended forms. The consolidated treaties are freely available for download from EUR-Lex, the EU's online legal information database.
Listed below, in reverse chronological order, are the treaties that have amended the EU's foundational treaties. The year in which each treaty became effective is noted in parentheses.