Ethnic map of the Balkans from 1889

[Gash]

From an Austrian supposedly

 

[Gash]

Seems like Albanians were much more widespread before but decreased after the first Balkan Wars. There was a lot of genocide and expulsion committed on Albanians during the Balkan Wars and forth by Serbian, Montenigrin and Greek forces and we became a minority in a lot of these areas. Pre Balkan wars even Southern Serbia had a predominantly Albanian population. Nish was basically an Albanian town.

https://en.m.wikipedia.org/wiki/Massacres_of_Albanians_in_the_Balkan_Wars

https://en.m.wikipedia.org/wiki/Expulsion_of_the_Albanians_1877–1878

https://en.m.wikipedia.org/wiki/The_Expulsion_of_the_Albanians

http://www.albanianhistory.net/1937_Cubrilovic/index.html