The European Economic Community (EEC) is founded.
The EEC was a predecessor of today’s European Union (EU).
Source
The European Union is established as the Maastricht Treaty is signed.
The United Kingdom left the European Union, also known as 'Brexit.'
Britain voted to leave the European Union.
The Maastricht Treaty came into effect, and with it, the European Union was formed.
Romania and Bulgaria joined the European Union.
