Organization of autonomous countries where trade between member states is free of restrictions, but where a
tariff or other restriction is placed on products entering the customs union from non-member states. Examples include the
European Union (EU), the Caribbean Community (CARICOM), the Central American Common Market, and the Economic Community of Central African States.
In the 19th century, the establishment of the Zollverein between German states was a significant factor contributing to eventual political union in Germany.
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