I was quite anti the EU but then I read this in “Bureaucracy” by Ludwig Von Mises:
If all trade barriers between member states were to be eliminated in Europe, a centralisation of political power would surely be the innevitable result? There are many things that the EU has achieved (or is striving to achieve) that most libertarians should approve of: Removal of trade barriers, free movement of capital and people, etc. If Mises was right, then we should expect to see a centralisation of political power across the EU. And if we are minachists like he was, we should welcome it as a good thing.
Now anarchists on the other hand would be bound to take a different view. I suppose they would prefer to break up nation states into smaller and smaller units, a continuous decentralising of power until the state has disappeared entirely.
But I am not an anarchist. I guess I should be in favour of the EU but focus on reform to stop the growth in the concentration (rather than centralisation) of power. Probably a futile hope, I know.