To be more precise the Treaty of Rome, the European Union was only formed in 1992 without asking anyone. In my view the Treaty of Rome was an excellent idea and if the Eurocrats hadn't sneaked in extras in order to control nation states there would be none of these problems we see today. The East European countries were never really cut out to be part of the EU, they love the free money but when asked to do something in return they point blank refuse.
Watch the domino effect once we get negotiations over Article 50 underway.