Enlargement and Membership

The Accession Process

Joining the EU is a long and demanding process. A country must meet the Copenhagen Criteria, established in 1993:

1. Political: Stable institutions guaranteeing democracy, rule of law, human rights, and protection of minorities.
2. Economic: A functioning market economy capable of competing within the Single Market.
3. Legal (acquis): Ability to adopt the entire body of EU law (the 'acquis communautaire') — over 80,000 pages of regulations.

The process typically takes a decade or more. Negotiations are divided into 35 'chapters' covering everything from agriculture to competition policy. Every existing member state must unanimously agree to admit a new member.

The Waves of Enlargement

The EU grew from 6 founding members to a peak of 28, before shrinking to 27 after Brexit. Each wave changed the Union's character.

The 2004 'Big Bang' — admitting ten mostly post-communist states — was the largest single enlargement and reunited Western and Eastern Europe after the Cold War.

Worked Example: Why Accession Takes So Long

Consider the current candidates. Turkey has been a candidate since 1999 yet negotiations have effectively stalled, blocked by concerns over democracy, human rights, and its dispute with EU member Cyprus. North Macedonia became a candidate in 2005 but was held up for years — first by Greece over its name (resolved by the 2018 Prespa Agreement renaming it North Macedonia), then by Bulgaria over language and history. Ukraine and Moldova, granted candidate status in June 2022, are only at the start of opening the 35 negotiating chapters.

Walk through why any one country can take a decade or more:

1. 35 chapters must each be opened, negotiated, and closed — covering courts, competition, agriculture, and more.
2. The full acquis (80,000+ pages of EU law) must be transposed into national law and actually enforced.
3. Unanimity is required at multiple stages, so a single member state (as Greece and Bulgaria showed) can freeze the whole process over a bilateral grievance.

The lesson: EU accession is not a diplomatic handshake but a wholesale transformation of a country's laws and institutions, policed by 27 governments that each hold a veto.