sentences:  The upper classes and the learned at that time, however, were German, and since 1864, the German language has prevailed in the town.On 1 April 1889, Flensburg became an independent city ("kreisfreie Stadt") within the Province of Schleswig-Holstein, and at the same time still kept its status as seat of the Flensburg district.In 1920, the League of Nations decided that the matter of the German-Danish border would be settled by a vote.