an agreement in 1795 between Spain and the U.S. by which Spain recognized the 31st parallel as the southern boundary of the U.S. and permitted free navigation of the Mississippi to American ships.
PINCKNEY'S TREATY
Meaning of PINCKNEY'S TREATY in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012