Pretty amazing that apart from Serbia none of these countries border Macedonia; very few of them are even anywhere nearby. People in the Balkans truly take hating your neighbors to the next level.
Also, you might get more hits for the Czech Republic if you accept Czechia as most quizzes on the site now do.
Yes , you are right , but that doesn't mean that Macedonia can't have other ethnicities . (For example There are around 500,000 albanians in Macedonia , + a lot more like Aromanians , Turks , Serbs Etc. In total Macedonians make up only around 64% of the population of Macedonia.)
Also, you might get more hits for the Czech Republic if you accept Czechia as most quizzes on the site now do.