States of Austria arable terrain. The other five states, in contrast, are located in the Alps and thus are comparatively unsuitable for agriculture. Their terrain is also relatively unfavourable to heavy industry and long-distance trade. Accordingly, the population of what now is the Republic of Austria has been concentrated in the former four states since prehistoric times. Austria's most densely populated state is the city-state of Vienna, the heart of what is Austria's only metropolitan area. Lower Austria ranks only fourth with regard to population density even though it contains Vienna's suburbs; this is due to large areas of land being predominantly agricultural.
States of Germany The Confederation was dissolved after the Austro-Prussian War. Prussia and the other states in Northern and Central Germany united as a federal state, the North German Federation, on July 1, 1867. The Southern states Bavaria, Württemberg, Baden and Hesse-Darmstadt entered military alliances with Prussia. In the Franco-Prussian War of 1870–71, those states joined the North German Federation. It was consequently renamed to German Empire, and the parliament and Federal Council decided to give the Prussian king the title of German Emperor (since January 1, 1871). The new German Empire included 25 states (three of them, Hanseatic cities) and the imperial