During the German Revolution of 1918–1919, the DHP advocated the implementation of a Free State of Hanover within the Weimar Republic and succeeded in having a plebiscite held in the Prussian Province of Hanover on 19 May 1924.
Selama Revolusi Jerman 1918-1919, Partai Jerman-Hannover mendukung pendirian Negara Bebas Hannover sebagai bagian dari Republik Weimar dan berhasil mengadakan plebisit di Provinsi Hannover pada 19 Mei 1924.