Rhineland
In 1946, the Rhineland was divided into the newly founded states of Hesse, North Rhine-Westphalia, and Rhineland-Palatinate. North Rhine-Westphalia is one of the prime German industrial areas, containing significant mineral deposits, (coal, lead, lignite, magnesium, oil, and uranium) and water transport. In Rhineland-Palatinate agriculture is more important, including the vineyards in the Ahr, Mittelrhein, and Mosel regions.
Treis-Karden
Beginning in 1794, both centres lay under French rule. In 1815 they were assigned to the Kingdom of Prussia at the Congress of Vienna. Since 1946, they have been part of the then newly founded state of Rhineland-Palatinate. On 7 June 1969, the two centres, until then each a separate municipality, were merged to form the new municipality of Treis-Karden.