Perhaps this would be of interest to you Sir... :)
The first treaty between the US and the Caliphate:
In 1783 the first US navy boat started to sail in international waters and within two years was captured by the Ottoman navy near Algeria. In 1793 12 more US navy boats were captured. In March 1794 the US Congress authorized President Washington to spend up to 700 000 gold coins to build strong steel boats that would resist the Uthmani navy. Just a year later the US signed the Barbary Treaty to resolve the Uthmani threat. Barbary, was the term for the North African wilaya's of Algiers, Tunis, and Tripoli, under the rule of the Ottomans.
The terms of the treaty were:
The treaty will cost the US a one off payment of $992,463
The American ships captured would be returned and the American Navy was to be given permission to sail in the Atlantic Ocean and the Mediterranean Sea.
In return, the American government would pay $642 000 in equivalent gold.
The US would also pay an annual tax (tribute) of $12 000 in gold. The annual tribute would be calculated according to the Islamic calendar and not the Christian calendar
$585,000 would be paid for the ransom of the captured American sailors
A state of the art steel ship would be constructed and delivered to the Uthmani's, built in the US with all costs borne by the US in return for privileges. (The costs of masts, Yards, and heavy planks, were very costly and so difficult to procure, and then so exceedingly expensive to transport. Once delivered the US had actually paid thirty times their estimated price in the stipulations).
The treaty was written in Turkish and signed by President Washington, This is the only American legal document to ever have been concluded in a foreign language and the only treaty the Americans have ever signed that agrees to pay annual tax to another nation. This treaty continued until the Caliphate was abolished.
Source:
http://www.pakistanintellectuals.com/news/featured-news/477-the-achievements-of-the-islamic-khilafah-
