The term refers to the North African pirates operating from ports along the Barbary Coast (primarily Algiers, Tunis, Tripoli, and Morocco) who engaged in acts of piracy and slave trading in the Mediterranean Sea and the Atlantic Ocean from the 16th through the early 19th centuries. These pirates posed a significant threat to European and American shipping, capturing vessels and enslaving their crews and passengers. For example, American merchant ships were routinely seized, and their crews held for ransom, impacting American trade and foreign policy in the early years of the republic.
This historical phenomenon is significant in the context of United States history because it directly influenced the development of the U.S. Navy and shaped early American foreign policy. The inability of the fledgling United States to effectively protect its merchant fleet led to the Barbary Wars (1801-1805 and 1815). These conflicts forced the U.S. government to confront the issue of maritime security and ultimately demonstrated the need for a strong naval presence to protect American interests abroad. Success in these wars enhanced American prestige and contributed to a growing sense of national identity.