In 1789 , the Jay -- Gardoqui Treaty granted Spain the exclusive right to navigate the Mississippi River for 30 years .
In 1789 , the Jay -- Gardoqui Treaty was not ratified because of opposition from Western states .
In 1789 , the Jay -- Gardoqui Treaty granted Spain the exclusive right to navigate the Mississippi River for 30 years , but was not ratified because of opposition from Western states .