Due to the legacy of the Ottoman Empire, which was religiously rather tolerant, Austria-Hungary was confessionally very diverse in the 19th and early 20th centuries.
Confessional majorities in 1910, map, 2010, historical concept: H. Rumpler, thematic cartography: M. Seger, graphics and statistics: W. Liebhart, P. Urbanitsch, U. Harmat; source: Rumpler, Helmut / Urbanitsch, Peter (eds.): Soziale Strukturen, 2nd volume: Die Gesellschaft der Habsburgermonarchie im Kartenbild: Verwaltungs-, Sozial- und Infrastrukturen: Nach dem Zensus von 1910, Vienna 2010, p. 73. With the generous permission of the Austrian Academy of Sciences.