Greater Hesse (German: Großhessen) was a part of the American Occupation Zone of Germany after World War II
The German Empire broke up after World War I. The Grand Duchy of Hesse-Darmstadt (German: Grossherzogtum Hessen-Darmstadt) became the People's State of Hesse (German: Vollksstaates Hessen) on 2 March 1919.
After World War II, on 19 September 1945, the American Military Government joined Hesse-Darmstadt (except for Rheinhessen) with parts of the Prussian provinces of Kurhessen and Nassau to form Greater-Hesse.
On 18 December 1946 the state was renamed Hesse, and in 1949 became a part of the Federal Republic of Germany.