In 1919, at the time of its annexation, the middle part of the County of Tyrol which is today called South Tyrol was inhabited by almost 90% German speakers. Under the 1939 South Tyrol Option Agreement, Adolf Hitler and Benito Mussolini determined the status of the German and Ladin (Rhaeto-Romanic) ethnic groups living in the region. They could emigrate to Germany, or stay in Italy and accept their complete Italianization. As a consequence of this, the society of South Tyrol was deeply riven. Those who wanted to stay, the so-called Dableiber, were condemned as traitors while those who left (Optanten) were defamed as Nazis. Because of the outbreak of World War II, this agreement was never fully implemented. Illegal Katakombenschulen were set up to teach children the German language.

South Tyrol is an autonomous province in northern Italy. An English translation of the official German and Italian names could be the Autonomous Province of Bolzano – South Tyrol, reflecting the multilingualism and different naming conventions in the area. Together with the autonomous province of Trento, South Tyrol forms the autonomous region of Trentino-Alto Adige/Südtirol. The province is the northernmost of Italy, the second largest with an area of 7,400 square kilometres (2,857 sq mi), and has a total population of about 534,000 inhabitants as of 2021. Its capital and largest city is Bolzano.