March 1, 1784 | Report Resolutions from the Committee for the Western Territory, March, 1, 1784. With Jeremiah Townley Chase and David Howell, Thomas Jefferson issues recommendations for the division and government of the western edges of United States territory. The preferred boundaries of future states are laid out and vaguely classical and Indian names are given the various regions. Congress did not adopt the Ordinance as Jefferson submitted it, primarily rejecting the abolition of slavery in the region and Jefferson's nomenclature. As passed by Congress, it became the Ordinance of 1784.
July 13, 1787 | Letter Northwest Ordinance, July 13 1787. Setting the stage for western expansion, the Northwest Ordinance of 1787 shaped the development of the territory north and west of the Ohio River.
August 9, 1803 | Letter Thomas Jefferson to John Dickinson, August 9, 1803 Thomas Jefferson expresses his pleasure at the Louisiana Purchase, and explains the importance of the territory as a buffer against Spanish expansion.