Answer: blockades

AnswerCrossword Clue
BLOCKADESSome trade barriers
blockadesBLOCKADE, to block with troops or ships
blockadesAn obstruction of a physiological or mental function, esp. of a biochemical receptor
blockadesAn act of sealing off a place to prevent goods or people from entering or leaving
blockadesAnything that prevents access or progress