With the conquest of the former Tecklenburg office of Cloppenburg in 1400, the common history of today's Oldenburg Münsterland in the Lower Chapter of Münster began.
As a result of the Reichsdeputationshauptschluss of 25 February 1803, the Protestant Duke of Oldenburg gained state power over the offices of Cloppenburg and Vechta, whose population has remained predominantly Roman Catholic to this day.
During the so-called French period (1811–1813), the Oldenburg Münsterland was administered by the French-Hanseatic Département de l'Ems-Supérieur (Department of the Upper Ems).
Since 1946, the Oldenburg Münsterland has belonged to the German state of Lower Saxony and includes the area of the federal districts of Cloppenburg and Vechta.
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