When Did Europe "Join Together"? The EU's Gradual Construction

There was no single moment when "Europe joined together." Instead, European integration unfolded in stages over seven decades:

Key Milestones

1. 1951 – ECSC: European Coal & Steel Community (6 founders: France, West Germany, Italy, Belgium, Netherlands, Luxembourg). Supranational control of war-critical industries.
2. 1957 – EEC & Euratom: Treaty of Rome creates European Economic Community (common market) and European Atomic Energy Community.
3. 1973 – First enlargement: UK, Ireland, Denmark join.
4. 1981/1986 – Southern expansion: Greece, then Spain & Portugal.
5. 1993 – Maastricht Treaty: European Union formally established; single market, citizenship, EMU roadmap.
6. 1995 – EFTA entrants: Austria, Finland, Sweden.
7. 2004/2007/2013 – Post-Cold War waves: 10 (mostly ex-Eastern Bloc) + 2 + 1 = 28 members.
8. 2020 – Brexit: UK leaves; EU at 27.
9. 2022–present – Candidate status: Ukraine, Moldova, Bosnia, Georgia; Turkey frozen.

What "Joined Together" Means

• Single Market: Free movement of goods, services, capital, people.
• Eurozone: 20 of 27 share the euro.
• Schengen: 23 EU + 4 non-EU = passport-free travel.
• Common policies: Trade, competition, agriculture, climate, foreign policy (partial).

Europe's union is a process, not an event—and it's still evolving.