Rhineland-Palatinate
The state of Rhineland-Palatinate was founded shortly after the Second World War on 30 August 1946. It was formed mainly from the southern part of the Prussian Rhine Province (the "Regierungsbezirke" of Koblenz and Trier), from Rhenish Hesse, from the western part of Nassau and the Bavarian Rhenish Palatinate minus the county of Saarpfalz. The Joint German-Luxembourg Sovereign Region ("Gemeinschaftliches deutsch-luxemburgisches Hoheitsgebiet") is the only unincorporated area of the state of Rhineland-Palatinate. This condominium is formed by the rivers Moselle, Sauer, and Our, where they run along the border between Luxembourg and Rhineland-Palatinate or the Saarland.
North Rhine
It was formed on 5 June 1945 on the basis of the Berlin Declaration and the resulting creation of occupation zones for the victors of World War II out of the administrative regions ("Regierungsbezirke") of Aachen, Düsseldorf and Cologne, which were all part of Prussia's Rhine Province. The southern part of Rhine province, consisting of the administrative regions of Koblenz and Trier became part of the French occupation zone on 5 June 1945. The division of the Rhineland, which had been united in 1815 by the Congress of Vienna under the Prussian crown, was thus pre-destined to be split between different governments and administrations - from summer 1946 into the states of North Rhine-Westphalia and Rhineland-Palatinate. Rhine Province existed until 20 October 1946. On that day the government formed in August 1946 for the state of North Rhine-Westphalia dissolved the upper councils of the provinces of North Rhine and Westphalia on the instructions of the British occupying power.