Because Josep Broz tito died in 1980 and basically after that the whole country went into downturn until 1991 when they were officially in war until 1995 (a HORRIBLE war). This was because of religious clashes. The serbs did not like the muslims so they basically wiped them out through genocide and lots of other horrible war crimes such as rape, enslavement and work camps. this war killed 140 000 people! destroying a nation and breaking it up.
KOS - Yugoslavia - was created in 1946.
Kingdom of Yugoslavia was created in 1918.
Parliament of Yugoslavia was created in 1946.
Air Yugoslavia was created in 1969.
Live in Yugoslavia was created in 1983.
Return to Yugoslavia was created in 1997-12.
Yugoslavia was created after WW I.
Socialist Party of Yugoslavia was created in 1921.
Democratic Party - Yugoslavia - was created in 1918.
Bishops' Conference of Yugoslavia was created in 1918.
Union of Pioneers of Yugoslavia was created in 1942.
Ministry of Defense - Yugoslavia - was created in 1918.