Foreign-trade zones of the United States

In the United States, a foreign-trade zone (FTZ) is a designated area located in or near a U.S. port of entry where domestic and foreign merchandise is considered outside U.S. customs territory for tariff purposes. In these zones, goods may be imported, stored, manipulated, manufactured, or re-exported without being subject to customs duties or other ad valorem taxes until they enter U.S. commerce.

Source: Wikipedia — Foreign-trade zones of the United States (CC BY-SA 4.0)