The Free State Bottleneck was a short-lived quasi-state that existed from 10 January 1919 until 25 February 1923. It was formed out of part of the Prussian province of Hesse-Nassau as a consequence of the occupation of the Rhineland following World War I. The Bottleneck is now part of the modern German states of Hesse and Rhineland-Palatinate.
Following the Armistice of 1918, Allied forces occupied the German territory west of the Rhine. To maintain a military presence on the eastern side, the Allied powers extended their zones of occupation by creating three semi-circular bridgeheads of 30 km radius, radiating from Cologne , Koblenz , and Mainz .
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