Read Wikipedia's overview on the issue, but I'll throw in some extra data.I mean based on the bit of reading I've done on this subject that appears to be the gist of it and I'm like but why tho?
Greece's side: Because of irredentism. Everybody claims Macedonia (the region) for themselves: Serbia, Bulgaria, Greece, and the homegrown Macedonian government. To people from the U.S. it's completely ridiculous because the US has existed for not even 250 years yet, but to these people a couple centuries is just yesterday and a war that happened a hundred years ago is only this morning or perhaps yesterday.
Here's also a few more recent factors that complicate things:
- the Greek Civil War that followed WWII between Communists backed by Bulgaria and Yugoslavia on one side and the restored monarchy backed by the Western Allies on the other. Tens of thousands were exiled to Belgrade and beyond (I recommend reading Z by Vassilis Vassilikós and watching this film by Maria Douza);
- the expulsion of the Greeks from Alexandria in the 1950s;
- the expulsion of the Greeks from Constantinople in the 1950s (I recommend watching Πολίτικη Κουζίνα, I don't know the name in English);
- the Turkish invasion of Cyprus in 1974 to establish (the occupation is still ongoing) the unrecognised republic of North Cyprus.
That would include, obviously, the Fourth Crusade and the subsequent partitioning of the Empire, but also the limitedness of response to the various atrocities committed during the 1820s (on both sides), which is still barely yesterday, or Britain taking advantage of the Ottoman defeat at Shipka to ‘liberate’ Cyprus by making it a colony and then making it an independent country, and the ongoing situation with the Greeks in Northern Epirus who gained their independence from the Turks in 1913 but got lumped in with the Albanians and are still there.
Which basically results in many Greeks being downright paranoid. Both Serbia and Bulgaria have owned parts of present-day Greek Macedonia, and (Northern/the Former Yugoslav Republic of) Macedonia somewhat laid a claim to all the region of Macedonia in its original constitution.
(Northern/the Former Yugoslav Republic of) Macedonia
Meanwhile, the (Northern/Former Yugoslav Republic of, i.e. Slavic) Macedonians need a name to highlight that they are not Western Bulgarians or South Serbs but a different entity and polity whatsoever; their territory corresponds to ancient Pæonia rather than Macedonia but it does correspond to mediæval (Serb-owned) Macedonia to some extent. The present-day capital of Macedonia, Skop(l)je, used to be the capital of the mediæval Serbian monarchy and, once again, the 1300s are just around the corner (see Milošević's speech at Gazimestan in 1989 for the 600th anniversary of the Battle of Kosovo which was the prelude to the Yugoslav Wars, and take into account the fact that Archduke Franz Ferdinand was assasinated by a Serb in Sarajevo precisely when Austro-Hungarian authorities were provocatively organising public events also on the anniversary of the Battle of Kosovo).
So thus the Republic protects itself from irredentist Serbian and Bulgarian ambitions.
To an outsider it might seem like an incomprehensible tangle of reasons and impossible to relate to, but to them it makes perfect sense.
If it makes even an inkling of sense I can post more, but this is quite a long read already.
Think of it, don't you still have people in the US who think the US should have conquered Mexico and/or Canada or that the CSA had every right to secede or a number of other things that foreigners cannot understand or relate to either.
I also have no doubt that Russia is probably very interested on helping fan the fires of nationalism there, as they seem to be in cahoots with Steve Bannon (they support Orbán, Marine Le Pen, nationalism for nationalism's sake, hate the EU and NATO), but that's a different thing.
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