William Short-William Charmichael Diplomatic Papers, 1793-1794. 3 items. Location: Vault:26. United States diplomats to Spain, Short and Charmichael's negotiations laid the groundwork for the San Lorenzo Treaty or Pinckney's Treaty, in which Spain agreed to America's version of the boundary between the United States and Louisiana, to open the Missisisppi River to American navigation since Spain owned the western bank, and to grant Americans the right to store exports and carry on commercial transactions in New Orleans. Papers include a statement of principles, letter, and memorandum related to their negotiations. For more information see online catalog, Mss. 4793