The problem with the EU is they have achieved nothing that non-EU countries have done.
All the claims are rubbish when one looks around the world at other countries. Trade, Commerce, Economy, Law and Order, Migration, Border Security, Terrorism, etc. The facts prove that the EU is often worse at regulating these areas. Weighed down by a suffocating bureaucracy, the mission to create something to please everyone and achieves in pleasing no one. Even the simple act of launching a single currency was beyond them.
They were more interested in getting the Euro into as many countries as possible, they abandoned simple rules. Such as a Central Bank controlling borrowing and spending, then allowed countries with a bad fiscal record to join the Euro. This is the result.
https://www.statista.com/statistics/...c-product-gdp/
So please tell us all what are the benefits of the EU, that non-EU countries can't achieve?