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In the 19th century, a general course and the very ideas of Yugoslavian union were formed, based on the union of German people into a single state.

In order for Yugoslavia to happen in Serbia, a standardisation and a reform of Serbian language was made, but was done in a way that a literary language was established by Vuk Stefanovic Karadzic as a variation of the language that was predominant only in north-western parts of Serbia, but also widely spoken in today's Bosnia and Herzegovina and Croatia. This determined Yugoslavian western expansion ambitions - namely expansion to include residents of today's Bosnia, Croatia and Slovenia in a single Yugoslavian state as a first step.

However, the language and the culture of the southeast parts, and even the mainland part of Serbia was much closer to the existent Bulgarian and Macedonian culture and language.

So my question is, what if in this period, Yugoslavian idea rose with different implementation principles, namely, the literary reform of Serbian language was made to make it much more similar to the today's Bulgarian and Macedonian language, with the notion that there first needed to be a cohesive Serbo-Bulgarian dominated Yugoslavian kingdom before expansion into western spheres of influence?

And what if this union was made possible at start, not with a means of war, but through a Serbo-Bulgarian royal marriage?

What consequences would this have? Would this Yugoslavia be inherently more stable than the version that played out in otl?

I think it would, because of the single unitary orthodox religion, greater proximity of the Russian Empire, you would have a Serbian language that after the different literary reform would in fact ressemble Bulgarian very closely, and I can even conceive a 20th century serbo-bulgarian language standardisation?

Also, I can easily see a much more successfull asimilation of Macedonians in this state by both Serbs and Bulgarians, to the point that the notion of Macedonian nation might not even have been formed in the first place.

Remark: By Macedonian people I here consider the residents of today's FYROM that identify themselves as of Macedonian nationality and their ancestors, and are of Slavic origin. This has nothing to do with Greek Macedonia, as in my personal opinion, the heritage over ancient Macedonian state is and can be claimed only by today's Greece, and this article is not to be understood in any way that would signify otherwise.
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