Callistemon21
Yugoslavia wasn't always one country - it was created after WW1 and named the Kingdom of the Serbs, Croats and Slovenes until 1929, when it became Yugoslavia.
It was a rather uneasy combination of fairly disparate countries.
I thought it was in 1919.
''
U.S. Recognition of the Independence of the Kingdom of Serbs, Croats, and Slovenes, 1919.
On February 7, 1919, the United States recognized the Kingdom of the Serbs, Croats and Slovenes through a statement released to the press by the U.S. Acting Secretary of State Frank Polk. The United States considered this new state as the successor state to the Kingdom of Serbia.''
My mother was at boarding school in Munich with the daughters of the Queen's representatives in Zagreb- and was invited to stay with them twice, in their mansion in Zagreb and their Castle in Bled. 1929 or 30. They all lost their lives when Tito took power.