What country has the longest-standing treaty with the U.S.? This 'Treaty of Friendship' with an African nation was negotiated by Thomas Barclay, and signed by Thomas Jefferson, John Adams and Muhammad III in 1786.

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The main objective of foreign policy is to use diplomacy - or talking, meeting, and making agreements - to solve international problems. 


1. What country has the longest-standing treaty with the U.S.? This 'Treaty of Friendship' with an African nation was negotiated by Thomas Barclay, and signed by Thomas Jefferson, John Adams and Muhammad III in 1786.