How did Oman’s relationship with the United States begin in the 19th century?

The relationship between the United States and Oman began with the Āl Bū Saʿīd dynasty in Muscat, with ties dating back to the presidency of George Washington (1789–1797).1

Formal diplomatic relations were established in 1833 when the two governments concluded their first treaty, known as a treaty of "Amity and Commerce". This foundation led to further diplomatic engagement in 1840, when Oman sent an emissary to the United States, marking the first time an Arab diplomat was accredited to the U.S. government.12