However, it was John Quincy Adams who laid the groundwork, FTP, for what agreement that effectively demilitarized the U.S.-Canadian border in 1817.
In 1864, Secretary of State William Seward attempted to abrogate this treaty, but he rescinded the abrogation before the end of the six-month grace period.  The initial agreement had placed limits 100 tons and an 18-pound cannon.  It resulted from negotiations between a former attorney general and then acting secretary of state and the British minister to the U.S.  However, it was John Quincy Adams who laid the groundwork, FTP, for what agreement that effectively demilitarized the U.S.-Canadian border in 1817.
In 1864, Secretary of State William Seward attempted to abrogate this treaty, but he rescinded the abrogation before the end of the six-month grace period.  
Rush-Bagot Agreement or Treaty