After the dissolution of the Austro-Hungarian monarchy in 1918, the area in which the Burgenland Croats lived was divided between Austria, Czechoslovakia and Hungary. After 1921, most of these areas became part of Austria, which established a new province of Burgenland, which later gave the Burgenland identifier to these Croats. In 1922, Austria founded the "Apostolic administration of Burgenland," and began to abolish bilingual schools, by introducing the German language to all primary schools. This process was temporarily stopped after "The National Education Act", that allowed the work of the Croatian elementary schools, was adopted. After Hitler annexed Austria in 1938, this law was abolished. In 1955, the "Austrian State Treaty" was signed. It gave permission to the Burgenland Croats to use Croatian in education, judiciary, and public administration. With the adoption of the "Law on National Minorities" in 1976, use of Croatian in public life became limited. After a constitutional complaint was heeded in 1987, parts of the law were changed and Croatian was introduced as an official in 6 out of 7 districts of Burgenland.