Denmark and Prussia
Rhine river and Danube river
Denmark lost Schleswig-Holstein (Slesvig-Holsten) in 1864 when they lost a war against Prussia and Austria
1. The Danish War- Against Denmark 2. The Seven Weeks' War- Against Austria 3. The Franco-Prussian War- Against France AAL
Prussia went to war with Austria and beat Denmark
Primarily in Denmark, but there is also approx. 50.000 living south of the Danish-German border. They became Prussian, and later German, citizens as a consequence of the 1864 war with Prussia and Austria (and subsequent war between Prussia and Austria), but remain culturally Danish. Aprox. 10% of the Greenland population are ethnic Danes.
Shleswig
He was a Danish general in the war with Prussia in 1864
Austria and Prussia
Schleswig and Holstein
Prussia annexed a bunch of German states and Italy annexed the Venetia and Friuli regions.
Austria and Prussia declared war on Denmark to regain the provinces of Schleswig and Holstein, which were ruled by the Danish crown but were predominantly German-speaking.