In the time of the Third Reich, after the Reich Law was enacted on 26 January 1937, Hintertiefenbach was transferred from Oldenburg (which then still existed as a territorial unit) to Prussia (which likewise still existed within Germany) with effect from 1 April 1937.
On 19 March 1945, the village was occupied by the United States Army, although by July of the same year, they had yielded their authority to the French.