After World War I, there was an attempt at a united Slavic nation in the Balkans. Unfortunately despite enduring many challenges, it would crumble dramatically before the turn of the century.
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Music used:
"Unrelenting", "Crypto", and "Devastation and Revenge" by Kevin MacLeod
found at www.incompetech.com

Sources:
CherepashkaShusha. "World War II Eastern Front (19411945) Every Day" (For aiding in depicting partisan control during World War II)
Maquze. "Breakup of Yugoslavia and Yugoslav Wars" (For aiding in depicting frontlines in Bosnia and Kosovo during the 90s)
Past Works
“Political Representation of BiH in the Kingdom of Serbs, Croats and Slovenes/Kingdom of Yugoslavia (1918 – 1941).” Parliamentary Assembly of Bosnia and Herzegovina, n.d.
Wikipedia (For Prime Ministers and Kings list)