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Updated:Apr 23, 2026
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2004 'Big Bang' Enlargement: Central and Eastern Europe (1997-2004)

2004 'Big Bang' Enlargement: Central and Eastern Europe (1997-2004)

  1. Accession negotiations open with first six applicants

    Labels: Accession negotiations, Cyprus
  2. Berlin European Council agrees Agenda 2000 financing

    Labels: Berlin European, Agenda 2000
  3. Helsinki European Council expands the negotiation group

    Labels: Helsinki European
  4. Accession negotiations open with the “Helsinki group”

    Labels: Accession negotiations, Helsinki group
  5. Laeken Declaration launches a convention on EU reform

    Labels: Laeken Declaration, Convention on
  6. Copenhagen European Council concludes talks with ten countries

    Labels: Copenhagen European
  7. Accession Treaty is signed in Athens

    Labels: Treaty of, Athens signing
  8. Poland approves EU membership in a national referendum

    Labels: Poland referendum
  9. Ten countries join the European Union (Big Bang enlargement)

    Labels: Big Bang, European Union