In the 18th century, the Barbary threat became serious. In July 1785, two American boats were returned to Algiers; In the winter of 1793, eleven American ships, their crews in chains, were in the hands of the dey of Algiers. To ensure the freedom of movement of its commercial fleet, the United States was obliged to conclude treaties with the main Barbary states, paying considerable sums of money as a guarantee of non-aggression. With Morocco, treaty of 1786, 30,000 dollars; Tripoli, November 4, 1796, $56,000; Tunis, August 1797, 107,000 doll...
