America's Historical Documents has images from a collection of core American democracy documents (National Archives).

A Century of Lawmaking for a New Nation:
  U.S. Congressional Documents and Debates 1774-1873
  Congress, Continental Congress and Constitutional Convention includes: Farrands Records, Elliots Debates, Statutes and Documents, the Journals of Congress, and the Debates of Congress
  (Library of Congress)

Indian Affairs: Laws and Treaties (Kappler)
   Covers U.S. Government treaties with Native Americans from 1778-1883 (Volume II) and U.S. laws and executive orders concerning Native Americans from 1871-1970 (Volumes I, III-VII).