The Zollverein was a customs union that existed in Germany from 1834 to 1919. It was a coalition of German states that abolished internal customs duties and established a uniform tariff on goods imported from outside the union. The Zollverein was an important step towards the unification of Germany and the growth of the German economy.

Changes brought by the Zollverein:

1. Economic integration: The Zollverein brought economic integration among German states by removing trade barriers and customs duties. This led to the growth of trade and commerce within the union and increased economic prosperity.

2. Industrialization: The Zollverein facilitated industrialization in Germany by creating a large and unified market. The uniform tariff system made it easier for manufacturers to sell their products throughout the union, which encouraged the growth of industry.

3. Political unification: The Zollverein paved the way for political unification of Germany. The customs union created opportunities for cooperation and collaboration among German states, which helped to build a sense of national identity.

4. Modernization: The Zollverein encouraged modernization in Germany by promoting the development of infrastructure, such as railways and canals, which made it easier to transport goods throughout the union.

5. Social changes: The Zollverein brought about social changes in Germany by creating jobs and improving living standards. The economic growth and modernization that resulted from the customs union created new opportunities for workers and their families.

In conclusion, the Zollverein was a significant development in the history of Germany. It helped to bring about economic, industrial, and political changes that paved the way for the unification of Germany and the growth of its economy.