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