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The main purpose of Customs Union is to extend the trading area for business.
Southern African Customs Union was created in 1910.
Not usually.
As the EU is a customs Union, mail sent from one country to another does not have to be inspected by customs.
When members of a free trade area:
1) add common external tariffs to the provisions of the free trade agreement
2) Abolish all customs checks between the countries.
then the free trade area becomes a customs union.
The European Union.