Wendish question
The border between Hungary and Kingdom of Serbs , Croats and Slovenes was finally regulated by the Treaty of Trianon on June 4 , 1920 . The territory inhabited by Slovenes ( the so-called "Vendvidék" ) was divided by the watershed of the two rivers Rába and Mura . The Mura region ( Prekmurje ) , including the areas of Murska Sobota and Lendava , went to Kingdom of Serbs , Croats and Slovenes , while the Raba Region ( Porabje ) including nine communes around Szentgotthárd , became part of Hungary . 
<triplet> Treaty of Trianon <subj> June 4, 1920 <obj> point in time