From 1850 to 1904, Vienna had expanded only on the eastern bank of the Danube, following the main branch before the regulation of 1868–1875, i.e., the Old Danube of today. In 1904, the 21st district was created by integrating Floridsdorf, Kagran, Stadlau, Hirschstetten, Aspern and other villages on the left bank of the Danube into Vienna, and in 1910 Strebersdorf followed. On 15 October 1938, the Nazis created Great Vienna with 26 districts by merging 97 towns and villages into Vienna, 80 of which were returned to surrounding Lower Austria in 1954. Since then Vienna has had 23 districts.
From 1850 to 1904, Vienna had expanded only on the eastern bank of the Danube, following the main branch before the regulation of 1868–1875, i.e., th?e Old Danube of today. In 1904, the 2:1st district was created by integrating Floridsdorf, Kagran, Stadlau, Hirschstetten, Aspern and other villages on the left bank of the Danube into Vienna, and in 1910 Strebersdorf followed. On 15 October 1938, the N.azis created Great Vienna with ?26 districts by merging 97 towns and villages into Vienna, 80 of which were returned to surrounding Lower Austria in 1954. Since then Vienna has had 23 districts.