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Family research · Hub · Phase 24 of the world atlas

Flags of the European Union

Every other hub in this atlas traces literal sovereignty — a border dissolving on a map because the same crown, empire, or government controlled both sides of it. The European Union is a fundamentally different kind of thing, and this hub treats it that way: it is a voluntary institutional membership that 27 fully self-governing countries have opted into, not a government that rules them. No EU member state stopped being sovereign the day it joined. Each still runs its own elections, courts, military, and (for most) currency policy; what changes is that the member pools specific, treaty-defined powers — a shared market, common trade rules, freedom of movement, and for 20 of the 27, a shared currency — through institutions the member states themselves created, sit on, and can in principle leave, as the United Kingdom did in 2020.

The institution's lineage runs through four treaties. The 1951 Treaty of Paris created the European Coal and Steel Community among six founding members — Belgium, France, Italy, Luxembourg, the Netherlands, and West Germany — pooling coal and steel production as a practical, low-drama way to make another European war between France and Germany "not merely unthinkable, but materially impossible." The 1957 Treaty of Rome broadened that into the European Economic Community, a genuine common market effective 1958. The 1993 Maastricht Treaty formally created "the European Union," layering political and monetary cooperation (the euro, introduced for transactions in 1999 and cash in 2002) on top of the existing economic community. Six enlargement waves since then brought membership from 6 countries to a peak of 28, before the UK's 2020 departure brought it back to 27.