Problems associated with
expansion (1800-1850):
Selected Works of Thomas Jefferson:
Jefferson's letter to Meriwether Lewis (1803): http://www.mt.net/~rojomo/landc.htm
Miscellaneous Papers:
Nathaniel Wyeth, Journals of Expeditions to the Oregon Country (1831-1836) (excerpts):
William Barret Travis, Letter from the commandancy of the Alamo (1836):