Topic summary
German customs union

Extracted from the Wikipedia article Zollverein.
1820s and 1830s
In 1834, Baden and Württemberg joined the Prussian union, which was renamed the German Customs Union. The Tax Union or Steuerverein was formed in 1834 as a customs union first of the Duchy of Brunswick and the Kingdom of Hanover, then with the Grand Duchy of Oldenburg in 1836. By 1835, the German Customs Union had expanded to include the majority of the states of the German Confederation, even Saxony, the Thuringian states, Württemberg and Baden, Bavaria, and the Hessian states. Functionally, it removed many internal customs barriers, while upholding a protectionist tariff system with foreign trade partners.