I lived in the United Sates of America for a short while a few years ago. One of the things that struck me was how little I understood it, despite growing up surrounded and immersed in its entertainment output, and despite visiting it.
It isn't until you live somewhere and have to deal with the same bureaucracy of living that you really start to get it. Car registration for example was anti-diluvian, even when I was there.
But I didn't realise how different everywhere was either. The States may be united, but they are very much their own entity too. A shared currency perhaps, but with different tax regimes and different holidays. And of course different cultures.
No one would claim the East coast is the same as the West, the North the same as the South, Mississippi the same as Washington... and this is after how many years of existing?
The Kingdom Union is much the same. We share a common currency, army and many other things. But we have different things, even though government is broadly centralised, there's been an expansion of local powers for local affairs.
Welsh is now once again a proud language and each country takes great pride in its football and rugby football teams, but in the Olympics we're on the world stage as Team GB. And of course we share our unelected and hereditary head of state.
I was asked the other day by a brexit supporter, in an accusatory and repremandatory (I just made that word up) tone whether I supported a United States of Europe and the consequent loss of national identity, prestige and power.
And I suppose I do, really. I simply don't see that there would be a loss of prestige, power or identity, in the same way there hasn't been a diminution of Scotland or Wales on the world stage, or of California or Massachusetts. England, Scotland. Wales and NI are enriched by borderless trade and free movement of people, just as the individual states are in America.
Some people cite the loss of the Pound being a grievous thing, without which Britain simply wouldn't be Britain. But our currency has changed even in my life time, from the distinctly odd Imperial to Decimal - but we're still British.
The history of the Pound makes for interesting reading. Guess where it came from? France! :D hahahaha! Yes - although France then wasn't the France of today. Here's what Wikipedia has to say:
"The pound was a unit of account in Anglo-Saxon England, equal to 240 silver pennies and equivalent to one pound weight of silver. It evolved into the modern British currency, the pound sterling.
The accounting system of 4 farthings = 1 penny, 12 pence = 1 shilling, 20 shillings = 1 pound was adopted from that introduced by Charlemagne to the Frankish Empire (see French livre).
The origins of sterling lie in the reign of King Offa of Mercia (757–796), who introduced the silver penny. It copied the denarius of the new currency system of Charlemagne's Frankish Empire.
As in the Carolingian system, 240 pennies weighed 1 pound (corresponding to Charlemagne's libra), with the shilling corresponding to Charlemagne's solidus and equal to 12d. At the time of the penny's introduction, it weighed 22.5 troy grains of fine silver (32 tower grains; about 1.5 g), indicating that the Mercian pound weighed 5,400 troy grains (the Mercian pound became the basis of the tower pound, which also weighed 5,400 troy grains, equivalent to 7,680 tower grains, about 350g)"
So there's nothing fixed about the Pound per se, just its place in the imagination. France is no less French for having adopted the Euro, finally displacing the Franc, which had just as much heritage as the Pound.
This is rather a ramble, so I'm going to close with this - the only constant is change. And change is not to be feared, just as there is nothing to be feared from a USoE.