Tripoli, Tunis, Algiers, and Morocco Were Moslem States and They Extorted Tribute from Europe through Terror; the Dutch, Danes, Swedes, and Venetians All Paid Annual Tribute to the Barbary States

Jay already had instructed Adams and Jefferson to make treaties with the Barbary States, authorizing them to pay up to $80,000 in borrowed money from Holland, or wherever they could get credit for the customary presents. However, before the ministers entered any negotiations, they wanted to learn what the European nations were paying, and they almost surely took time to review their small store of facts about the Barbary States.

It was widely known among educated Americans that Tripoli, Tunis, Algiers, and Morocco were Moslem states and extorted tribute from Europe through terror. Less well known was the fact that Tripoli, Algiers, and Tunis were regencies of the Ottoman Empire, but Morocco was not. The three regencies were ostensibly under the rule of the sultan in Constantinople, but in truth they were virtually autonomous—and remained that way so long as they sent the sultan gifts periodically—and each regency had evolved its own succession. While the Barbary States, with Algiers historically predominant, presented a solid, menacing front to Christian Europe and America, they negotiated treaties independently, competed fiercely with one another and occasionally quarreled over territory, sometimes to the extent of going to war. And, confusingly, Algiers, Tunis, and Tripoli happened to be the names of the capital cities of their respective countries; Tangier was Morocco’s capital.

At the end of their inquiry into European tributary payments, Jefferson and Adams knew only that the Dutch, Danes, Swedes, and Venetians all paid annual tribute—Venice in jewels and gold coins called sequins, and the others in naval stores and ammunition—but not how much. What would it cost for the United States to buy peace? The American diplomats didn’t know. Consequently, by early 1786 the two ministers had not even attempted to open treaty negotiations with any of the Barbary States.

--Joseph Wheelan, Jefferson's War: America's First War on Terror, 1801-1805 (New York: Carroll and Graf Publishers, 2004), e-book.