I believe OP was referring to the refugee crisis we've had in Sweden lately. It's put a huge strain on the country, and our prisons often have better amenities than refugee camps which is a recipe for disaster.

Actually, until Napoleonic wars, Sweden was pretty much in a constant state of war. For instance, my great-grandfather in 12th generation (then a Swedish subject in Östprovinsen, now known as Finland) earned himself a little manor house (tax-exempt and all that) by spending a couple of decades in the Thirty Years War pillaging Prague and other places.

Well, many others were also warring a lot then, but the change was quite abrupt in Sweden, and then the country even managed to stay out of WWI and WWII.

Of course, in Cold War it was actually operating with the U.S. but the war was not, well, hot.

Or Ethiopia

As long as pesky Nigel doesn't have his way.

Yeah, the Kalmar Union is the one debatable exception.

You can either view it as Sweden being ruled by Denmark, or a EU style union between equals, in which case 1523 is more of a Brexit situation.

There are decent arguments on both side. I lean towards the latter view.

Instituting a National Day in to remember it is more a modern way to try to keep up with the neighbors. All other countries have a national day, so we should get one too, even though we're not really sure what to do with it :)