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The Barbary pirates, also sometimes called Ottoman corsairs, were Muslim pirates and privateers that operated from North Africa, from the time of the Crusades until the early 19th century. Based in North African ports such as Tunis in Tunisia, Tripoli in Libya, Algiers in Algeria, Salé and other ports in Morocco, they primarily commandeered western European ships in the western Mediterranean Sea. Their stronghold was along the stretch of northern Africa known as the Barbary Coast (a medieval term for the Maghreb after its Berber inhabitants), but their predation was said to extend throughout the Mediterranean, south along West Africa's Atlantic seaboard, and into the North Atlantic as far north as Iceland. They often made raids, called Razzias, on European coastal towns to capture Christian slaves to sell at slave markets in places such as Algeria and Morocco.[1][2] According to Robert Davis, from the 16th to 19th century, pirates captured 1 million to 1.25 million Europeans as slaves. These slaves were captured mainly from seaside villages in Italy, Spain and Portugal, and from farther places like France or England, the Netherlands, Ireland and even Iceland and North America.
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The Knights Hospitaller, also known as the Knights of St. John, had begun their occupation of Rhodes in 1309. They created a new identity as the "Knights of Rhodes" and began to engage the Barbary Pirates in naval warfare, as part of their greater war on the Ottoman Empire.

To protect Rome from Islamic invasion, in 1530 Charles V deeded the islands of Malta to the knights. The newly christened "Knights of Malta" widened their war against the pirates and their Ottoman masters to include the entire Mediterranean. From the 16th century until 1798, Malta served as a bastion defending Europe against the corsairs and pirates of Algeria and Barbary.
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In 1798, Napoleon seized Malta en route to his campaign in Egypt. Requesting safe harbor to resupply his ships, he waited until his ships were safely in port, and then turned his guns on his hosts. The Knights of Malta were unable to defend themselves from this internal attack. After holding the Barbary Pirates in check for centuries, they were forced to leave their island stronghold. Napoleon's actions created a power vacuum in the Mediterranean which the pirates exploited.
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This far it is collinear to what is happening in Somalia now.

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With the end of the Revolution by 1783 America became solely responsible for the safety of its own commerce and citizens. Without the means or the authority to field a naval force necessary to protect their ships in the Mediterranean, the nascent U.S. government took a pragmatic, but ultimately self-destructive route. In 1784, the United States Congress allocated money for payment of tribute to the Barbary pirates and instructed her British and French ambassadors (John Adams and Thomas Jefferson, respectively) to look for opportunities to negotiate peace treaties with the Barbary nations. Unfortunately, the price demanded for these treaties far exceeded the amount that Congress had budgeted.
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Negotiations don't help.

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In 1786, Thomas Jefferson and John Adams went to negotiate with Tripoli's envoy to London, Ambassador Sidi Haji Abdrahaman or (Sidi Haji Abdul Rahman Adja). Upon inquiring "concerning the ground of the pretensions to make war upon nations who had done them no injury", the ambassador replied:


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It was written in their Koran, that all nations which had not acknowledged the Prophet were sinners, whom it was the right and duty of the faithful to plunder and enslave; and that every mussulman who was slain in this warfare was sure to go to paradise. He said, also, that the man who was the first to board a vessel had one slave over and above his share, and that when they sprang to the deck of an enemy's ship, every sailor held a dagger in each hand and a third in his mouth; which usually struck such terror into the foe that they cried out for quarter at once.

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Paying tribute doesn't help either.

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Jefferson argued that paying tribute would encourage more attacks. Although John Adams agreed with Jefferson, he believed that circumstances forced the U.S. to pay tribute until an adequate navy could be built. The U.S. had just fought an exhausting war, which put the nation deep in debt. Federalist and anti-federalist forces argued over the needs of the country and the burden of taxation. Jefferson's own Democratic-Republicans and anti-navalists believed that the future of the country lay in westward expansion, with Atlantic trade threatening to siphon money and energy away from the new nation on useless wars in the Old World.[4] The U.S. paid Algiers the ransom, and continued to pay up to $1 million per year over the next 15 years for the safe passage of American ships or the return of American hostages. Payments in ransom and tribute to the privateering states amounted to 20 percent of United States government annual revenues in 1800.
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The solution.

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With the recommissioning of the American navy in 1794 and the resulting increased firepower on the seas, it became more and more possible for America to say "no".

On Jefferson's inauguration as president in 1801, Yussif Karamanli, the Pasha (or Bashaw) of Tripoli, demanded $225,000 from the new administration. (In 1800, Federal revenues totaled a little over $10 million.) Putting his long-held beliefs into practice, Jefferson refused the demand. Consequently, in May 1801, the Pasha declared war on the United States, not through any formal written documents but by cutting down the flagstaff in front of the U.S. Consulate. Morocco, Algiers, and Tunis soon followed their ally in Tripoli.

In response, Jefferson sent a group of frigates to defend American interests in the Mediterranean, and informed Congress. Although Congress never voted on a formal declaration of war, they did authorize the President to instruct the commanders of armed vessels of the United States to seize all vessels and goods of the Pasha of Tripoli "and also to cause to be done all such other acts of precaution or hostility as the state of war will justify."


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The frigate USS Enterprise carrying 12 six pounders and 90 men defeated Tripolitan corsair Tripoli a ship of 14 six pounders, manned by 80 men after a fierce but one-sided battle on August 1, 1801.

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http://en.wikipedia.org/wiki/USS_Enterprise