...ollowed the St. Mary's river from its mouth to its source, thence west to the Chattahoochee, thence along that stream to the 31st parallel, thence west to the Mississippi river, including the present State of Florida , parts of Alabama and Mississippi, and some parts of the present Louisiana. It also included all that territory west of the Rockies and north of the 42d parallel to the British possessions, and fro...