Customs Congress References Customs Congress Prussian history Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: international trade/ The Zollverein…by a central authority, the Customs Congress, in which each state had a single vote. A common tariff, the Prussian Tariff of 1818, shielded the member states from foreign competition, but free trade was the rule internally. Read More…by a central authority, the Customs Congress, in which each state had a single vote. A common tariff, the Prussian Tariff of 1818, shielded the member states from foreign competition, but free trade was the rule internally. Read More