Michigan Territory Extended To The Mississippi

Michigan territory had been extended to the Mississippi. See letter from Calhoun to Andrew Jackson in "Correspondence of John C. Calhoun"... . This letter also shows that Calhoun considered the expeditions which were to be sent up the Missouri and up the Mississippi a part of one plan. [Source]

Jim's Photo Of The Mississippi River

Source

Also from the letter: 

"I am very desirous by taking strong and judicious posts to break the British control over the Northern Indians; and, for this purpose it appears proper, that a much larger proportion of our military establishment should be posted on the Mississippi and its waters, which the arrangement proposed would admit of, without any derangement of your command."