Zollverein n. : Literally, a customs union; specifically, applied to the several customs unions successively formed under the leadership of Prussia among certain German states for establishing liberty of commerce among themselves and common tariff on imports, exports, and transit.

Example:
Does anyone know anything about the Zollverein?

Taxonomy
customs, Prussian, states, Prussia, territories, German states, Customs Union, German, Union, Central Europe, German Customs Union, agreements, Prussian state, Württemberg, borders, Germany, Prussian union, commercial barriers.

Defination from the web:
Zollverein, or German Customs Union, was a coalition of German states formed to manage customs and economic policies within their territories. ... Secondly, these historians argue, the Zollverein established an anti-Austrian tradition among the Prussians. ...