I lacked a sarcasm tag. But the point was the only *positive* effect is making what were formerly conflicting interests betweens states into conflicts within one state.
I was looking from the point of view that there must be some benefit to this union or else no one would be for it, right?
Wrong.
Thatcher was right, the EU is “perhaps the greatest folly of the modern era.”
She was correct.
On the EU, it does makes sense -- it's kept the peace between numerous feuding countries for a half-century.