Whither the EU?

Just as it looked like the EU was coming together, the Brits pull out.  Britain is the number 2 EU country, just behind Germany and ahead of France in terms of GNP, population, diplomatic effectiveness, American connections, lotta things.  To have your Number 2 member pull out has gotta be disheartening for the advocates of European unity. 
   And we may have further breakups in the works.  Catalonia, an important Spanish province, has voted in a referendum to succeed from Spain.  There has been some pushback by the government of Spain, and some stories about how turnout for the referendum was very light, say 20%.  If that's true, it says that only the hard core Catalans came out to vote.  And, if the Catalans succeed, the Basque region will be right behind.  And the Scots and the Welsh are making noises about pulling out of the United Kingdom (Britain).  That's four small provinces making succession noises.  Although I don't remember hearing anyone from these proto-mini-nations talk about joining the EU, it's a good bet that some, maybe all of 'em will apply for EU membership after they make their succession good. 
   The EU got started right after WWII.  The European survivors of that disaster wanted to prevent WWIII by welding Europe together into a single country.  The Americans were all in favor for that reason and to present a united front against Russian Communism.  It started small with a trade deal called the European Coal and Steel Community.  I don't remember, perhaps never knew, just what kind of a deal this was, but it worked.  Sometime in the 1960's the Common Market was declared.  Initially the Common Market had a mere six members, and Britain was not one of them.  In fact the Brits put together a trade block of their own, which lasted for some years.  Eventually the Brits, and their trade block joined the EU.  Then the Soviets collapsed and all the Warsaw pact satellites rushed to sign up with the EU as a defense against Soviet revanchism.  Then the big step, the Europeans launched a successful European currency, the Euro and that worked. 
   But, the EU never was able to pull together like the American United States did.  The EU members never surrendered control of their armed forces, or their diplomatic corps to the central EU government.  The American founding documents, the Declaration of Independence and the Constitution talk about base principles ( all men are created equal) and distribution of political power (executive, legislative, judicial).  The EU founding treaties are silent on most of the issues Americans find fundamental, and have a lot of happy talk about all the bennies EU citizens are entitled to, free healthcare, universal education, and the like, but don't divvy up the political power the way the Americans did.  The American states yielded up serious and important powers (rights to have their own armed forces, right to operate their own foreign policy, and a lot of other heavy duty stuff to the new federal government.  The European states didn't yield up an ounce of their sovereignty to Brussels.
   Where to next?  Will the rest of the EU hang together?  Or will more members follow the British lead and bail out?  Will the US offer Britain membership in NAFTA?  What about other EU refugee countries?  Stay tuned for future developments.