Was Kosovo a pre-WWI independent country?
No.
Nope. Newer was.
Territory of todays Kosovo was established by communist usurpators in Yugoslavia in 1946, by that time was integral part of Serbia from 1912 when was liberated from Muslim Turkish occupation that lasted from 1389 when Turkes invaded Serbia. Kosovo was just part, an authonomy established by communists.
basicaly, Kosovo was integral part of serbia, purely Serbs Christian peace of territory, untill Muslim occupator cama and communists after them setteled Muslim illegal immingrants from Albania in period of 1946-1990, and in 1999-sofar when USA and NATO let additional 300,000 Muslim illegal immigrants in Kosovo...