Schleswig-Holstein German or Danish

German or Danish?
How might you determine the nationality of an ancestor whose information came on a printed form in German, but whose dates and places were handwritten in Danish and the issuing administration was located in a city which lies unequivocally in Danish territory? Is he German or Danish because of historical, political, cultural or genetic origins? In the final analysis would you call him Danish or German? Here are a few thoughts:

History
The Danish Kingdom borders on the Frankish Empire (roughly modern Holstein) Schleswig becomes a Danish, Holstein a German duchy Under Frederik IV (1773) the two duchies become Danish territories Denmark loses the war against Prussia and Austria, and so has to relinquish the two duchies. Nordschleswig (Sønderjylland)  becomes Prussian property. Holstein falls to Austria. Schleswig-Holstein becomes a Kondominium (joined governance over an area) Schleswig-Holstein becomes a Prussian province A vote is taken by the population of Sønderjylland. The majority of the people vote to be part of Denmark. The border between Denmark and Germany changes to present specifications.
 * 9th century:
 * 12th century:
 * 18th century:
 * 1864:
 * 1867
 * 1920

Political History
When Denmark ruled over the two duchies, Schleswig and Holstein, the political fusion was a Personalunion (relationship between separate, sovereign states). Schleswig and Holstein were often parceled between royal lines (http://www.genealogy.sh.de/history/e/history.htm) However, each ruler would implement the laws and agreements of the Personalunion. They all would adhere to the same person as their head of state, the King of Denmark. The duchies were administered by the “Deutsche Kanzlei” in Kopenhagen.

Language
With the integration of Schleswig-Holstein into the Prussian state, the question of nationality was raised again and became the reason of much dispute. In 1867 the “language” border between the German and Danish ran roughly north of Viöl to Joldelund and Oeversee, but the political border lay further north.

In 1832 the Danes ordered Danish to be the judicial and administrative language where it was spoken in churches and taught in schools. In Sønderjylland (Nordschleswig) Danish news papers and libraries and an institution of higher learning (Rödding) were established. In 1840 Danish was the official language. By 1848 the border between the Danish and German languages became that of today’s political border between the countries.

When Prussia occupied the northern part of Schleswig-Holstein in 1865, Sønderjylland became part of its territory. German became the administrative language, especially in cities like Hadersleben, Apenrade, Tondern and Sonderburg.

With the establishment of the German Reich in 1871 it became obvious that Sønderjylland (Nordschleswig) was to speak German. Beginning in 1878 German was taught in schools. In the 1880s the Danish culture withdrew into the private sector, but not for long. Cultural and material support from Denmark produced more self-assurance and new institutions. The spirit of the popular vote as expressed in paragraph 5 of the Peace of Prague in 1866 intensified in Sønderjylland as the people struggled for a solution to the question of nationality. On June 15, 1920 Nordschleswig became Danish, including the German speaking areas of Hardersleben, Apenrade, Tondern and Sonderburg. Nonetheless, there are to this day German and Danish minorities in both Sønderjylland (Nordschleswig) and Sydslesvig (Landesteil Schleswig).

Conclusion
The historical, cultural and linguistic situation in the geographical area around the present-day border between Denmark and Germany has been so fluid and complex, that it might be difficult to make a definite pronouncement on an ancestor’s nationality. Perhaps additional family records or information reveal which language was used in the home. This might well end up being the most useful criterion for deciding.