Prussian-Hessian Customs Union
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The Prussian-Hessian Customs Union (German: preußisch-hessische Zollverein) was a customs union between the Kingdom of Prussia and the Grand Duchy of Hesse that was established in 1828. Several other states joined over the following years, most notably the Electorate of Hesse. The union was an important stepping stone towards the creation of the German Custom Union, which replaced it in 1834, and thus a first economic step towards the unification of Germany.