That's the point of a 'United States' though. To take policies that cover all 'members' and control them centrally. That's why Eurozone members gave away control on monetary policy to the ECB when they joined the Euro. The items I list are controlled centrally in the USA, Australia and were in the USSR. What would be the point of heading towards an USE if it isn't to provide a consistant policy on those items ?
But we didn't join the Euro mainly because the UK wanted to maintain a level of sovereignty.
I don't understand how can know future events with such certainly that you're prepared to make the country less well off financially
Yes I do claim Brexit is better than remaining - I don't believe being part of the eventual United States of Europe would be good for us. I've never said we would be better off financially though ..... and we certainly won't be in the immediate future.