H.P. Hansen, who was the political leader and parliamentary representative of the people of Southern Jutland in the Reichstag in Berlin – and sympathetic to Danish wishes – announced on 17 November 1918 that the constituency association of Northern Schleswig demanded that the Schleswig border issue be resolved by a referendum, thus leading to the prospect of Southern Jutland being reunited with Denmark. This call was made from the balcony of the People’s Home in Aabenraa.
The border issue was indeed resolved by a referendum. Reunification took place in 1920, following two referendums: one in what was called zone 1 (which was Northern Schleswig) and one in zone 2 (which was between Schleswig and Flensburg). The populations in the two zones had to vote whether they wished to be part of Denmark or part of Germany.
10 February 1920
Referendum in zone 1 (Northern Schleswig – what we know today as Southern Jutland). 75 % vote for the area to be Danish.
14 March 1920
Referendum in zone 2 (Middle Schleswig). 80 % vote for this area to remain part of Germany.
The referendum in the two zones determined the position of the border between Denmark and Germany.
05 May 1920
The Danish army take over zone 1. The following day Viggo Rothe Haarløv is appointed civil administrator for zone 1.
15 June 1920
Southern Jutland is transferred to Denmark, although the Allies provisionally retain sovereignty of the region. Denmark is granted sovereignty on 5 July, backdated to 15 June.
09 July 1920
King Christian X signs legislation on the incorporation of Southern Jutland into the Kingdom of Denmark, and Southern Jutland becomes a part of Denmark.
10 July 1920
King Christian X and his sons Knud and Frederik ride symbolically across the old border north of Christiansfeld. The royal family is then received with a celebratory church service in Haderslev and a visit to the People’s Home in Aabenraa.
11 July 1920
The main Reunification Festival takes place on the plateau at Dybbøl Banke, scene of a major battle in the Second Schleswig War. As well as the royal family, between 50,000 and 100,000 people take part in the celebrations.
12 July 1920
King Christian X is received on the square in Tønder by the town’s German-minded mayor. On the same day the king meets a group of Danish-minded citizens from Flensburg in Kruså.