Under a law passed in September 1789, Treasury Secretary Alexander Hamilton signed blank certificates in New York and sent them to the collectors of the various ports of the new nation, where the local collector of the port filled them out and signed them. This registration system was part of a Congressional effort to limit the merchant marine to American-built ships owned and crewed by Americans. If a ship met the necessary requirements, it would “be deemed and taken to be, and denominated, a ship or vessel of the United States,” with all the benefits of any U.S. laws. Baltimore collector O. H. Williams filled out and signed this form for the Schooner Robert, owned by Baltimore merchant William Patterson.
