Contrary to the hopes of German Schleswig-Holsteiners, the area did not gain its independence, but was annexed as a province of Prussia in 1867. Also following the Austro-Prussian War in 1866, section five of the Peace of Prague stipulated that the people of Northern Schleswig would be consulted in a referendum on whether to remain under Prussian rule or return to Danish rule. This condition, however, was never fulfilled by Prussia. During the decades of Prussian rule within the German Empire, authorities attempted a Germanisation policy in the northern part of Schleswig, which remained predominantly Danish. The period also meant increased industrialisation of Schleswig-Holstein and the use of Kiel and Flensburg as important Imperial German Navy locations. The northernmost part and west coast of the province saw a wave of emigration to America, while some Danes of North Schleswig emigrated to Denmark.