Yugoslavia, both the Kingdom (Kingdom of Yugoslavia, 1918–1943) and the Republic (SFR Yugoslavia, 1943–1992) was a union of several Slavic nations, and therefore not only sported the pan-Slavic colors but adopted the pan-Slavic flag as its own (later adding ared star). After the initialbreakup of Yugoslavia in the early 1990s, the two remaining Yugoslav republics—Montenegro and Serbia—reconstituted asFederal Republic of Yugoslavia in 1992 and asState Union of Serbia and Montenegro in 2003, and continued to use the pan-Slavic flag until its own dissolution when Montenegroproclaimed independence in 2006. Serbia continues to use aflag with all three Pan-Slavic colors, along with fellow republics Croatia and Slovenia.
Most flags with pan-Slavic colors have been introduced and recognized by Slavic nations following the first Slavic Congress of 1848, although Serbia adopted itsred-blue-white tricolor in 1835 and the ethnic flag ofSorbs (blue-red-white) had already been designed in 1842. Theflag of Slovene nation (white-blue-red), which was based on the flag ofCarniola, was introduced two months prior to the congress. CzechMoravians proclaimed their flag (white-red-blue) at the very congress. In 1848, Croatian viceroyJosip Jelačić first designed theflag of Croatia with its modern tricolor (red-white-blue) for the then-conceptedTriune Kingdom (and officially adopted by theKingdom of Croatia), a group of Slovenian intellectuals inVienna, Austria created theflag of Slovenia (white-blue-red), and the firstSlovak flag (in reverse layout – red-blue-white) was introduced and flown bySlovak revolutionaries.[4] Theflag of the Czech Republic adopted its threenational colors in 1920 with the founding ofCzechoslovakia.