"The Zollverein (pronounced [ˈtsɔlfɛɐ̯ˌʔaɪn]), or German Customs Union, was a coalition of German states formed to manage tariffs and economic policies within their territories. Organized by the ...
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1833 Zollverein treaties, it formally started on 1 January 1834. However, its foundations had been in development from 1818 with the creation of a variety of custom unions among the German states. By 1866, the Zollverein included most of the German states. The foundation of the Zollverein was the first instance in history in which independent states consummated a full economic union without the simultaneous creation of a political federation or union." - (en.wikipedia.org 09.01.2020)
