Europe's longest period of peace correlates with the existence of the EU. Most EU citizens have never known war. Not knowing what the EU protects them from, they feel they have nothing to lose by leaving it. There is nothing "inevitable" about the breakup of the EU, just as there was nothing inevitable about the Brexit. These departures require massive efforts on the part of small, motivated groups, who rely on enormous falsehoods to draw the vote of ignorants. Nigel Farage is already backing away from Leave's promises on healthcare.

  > Europe's longest period of peace correlates with the existence of the EU.

Europe's longest period of peace correlates with the existence of the EEC (1957–1993), not the EU (1993–).

Can you expand why the countries of the EU are so fundamentally incompatible that their breakup is inevitable (and, as you claim from the start)?

In the 90's, when the unification process between West and East Germany were ongoing, West Germany paid many billions to help the latter because its economy was tanked. In total, two trillion euros or so. The West Germans mostly didn't complain.

A few years ago, they were asked to contribute a few billions to Greece's economy that also was (and is, I presume) completely wasted. Most Germans complained loudly and politicians like Angela Merkel made it a point not to give them more money than absolutely necessary.

Why did they complain so much in Greece's but not East Germany's case? Think about that for some time then you see why the EU is doomed.

So NAFTA means Canada, the USA, and Mexico are more likely to go to war now?