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Treaty of Paris
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Treaties of Rome
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Signature of fusion treaty
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Accession of UK, Denmark and Ireland
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Accession of Greece
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Accession of Spanish and Portugal
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Treaty of Maastricht
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Accession of austria, sweden and finland
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Treaty of Amsterdam
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Treaty of Nizza
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Introduction of Euro
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Costitutional treaty
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Treaty of Lisbona
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Accession of Bulgaria and romania
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Accession of Croatia
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The UK left the UE