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The Schengen Agreement
Led to the creation of Europe's Schengen Area. It is an area where people can circulate freely without internal immigration controls. -
The Maastricht Treaty
The citizen of all member states became EU citizens with the series of rights, including the free movement of goods and services. -
The Amsterdam Treaty
It reformed EU institutions in preparation for the arrival of new member countries. -
The Nice Treaty
It reformed institutions so that the EU could function efficiently after expansion. -
The Lisbon Treaty
It aimed to make the EU more efficient , more democratic and better able to address global problems ,such as climate change.