The Zollverein or German Customs Union was a coalition of German states formed to manage tariffs and economic policies within their territories. Organised by the 1833 Zollverein treaties, the Zollverein formally came into existence 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 had consummated a full economic union without the simultaneous creation of a political federation or union.