Update README.md

Updated Readme and added wikipedia information as well as information about the data and some context such as US having violated many of these agreements.

README.md

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+This is a dataset of tabular data regarding treaties between the USA and Native American Tribes/Nations, to date, including many executive orders.
+Table columns include Year, Date, Treaty name, "Alternative Treaty name", Statutes, "Land cession reference (Royce Area)", Tribe(s).
+All of those listed include the USA (United States of America) as a party, however the Tribal or Native American Nations in each many vary and may on occasion not be the same decision making parties as currently go by those same tribal names now.
+Note that a significant number of these treaties have been broken and violated by the United States. There are constant and ongoing legal battles nationally in the USA and internationally to attempt to rectify the violations by the United States.
+Cleaned and improved from original version on Wikipedia, by completing some column information that was available elsewhere in the wikipedia article.
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+From Wikipedia:
+From 1778 to 1871, the United States government entered into more than 500 treaties with the Native American tribes;[24] all of these treaties have since been violated in some way or outright broken by the U.S. government,[25][26][27][28] with Native Americans and First Nations peoples still fighting for their treaty rights in federal courts and at the United Nations.[26][29]
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+In addition to treaties, which are ratified by the U.S. Senate and signed by the U.S. President, there were also Acts of Congress and Executive Orders which dealt with land agreements. The U.S. military and representatives of a tribe, or sub unit of a tribe, signed documents which were understood at the time to be treaties, rather than armistices, ceasefires and truces.
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+The entries from 1784 to 1895 were initially created by information gathered by Charles C. Royce[30] and published in the U.S. Serial Set,[31] Number 4015, 56th Congress, 1st Session, in 1899. The purpose of the Schedule of Indian Land Cessions was to indicate the location of each cession by or reservation for the Indian Tribes. Royce's column headings are titled: "Date, Where or how concluded, Reference, Tribe, Description of cession or reservation, historical data and remarks, Designation of cession on map, Number, Location".[32]
+The Ratified Indian Treaties that were transferred from the U.S. State Department to the National Archives were recently conserved and imaged for the first time, and in 2020 made available online with additional context at the Indigenous Digital Archive's Treaties Explorer, or DigiTreaties.org.[33][34]
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+References from the Wikipedia page: 
+ The Avalon Project : Documents in Law, History and Diplomacy Archived 2007-06-27 at the Wayback Machine
+ "Treaty on maritime boundaries between the United Mexican States and the United States of America" (PDF). 1978-05-04.
+ "IDA Treaties Explorer". Indigenous Digital Archive. Santa Fe, New Mexico: Museum of Indian Arts & Culture. Retrieved 2020-10-19.
+ Vargo, Samuel (21 November 2014). "With more than ..500 treaties already broken, the government can do whatever it wants, it seems..." Daily Kos. Retrieved 9 October 2016. More than 500 treaties have been made between the government and Indian tribes and all were broken, nulllified or amended.
+ Toensing, Gale Courey (23 August 2013). "'Honor the Treaties': UN Human Rights Chief's Message". Indian Country Today Media Network. Archived from the original on 7 October 2016. Retrieved 9 October 2016. The U.S. federal government entered into more than 500 treaties with Indian nations from 1778 to 1871; every one of them was "broken, changed or nullified when it served the government's interests," Helen Oliff wrote in "Treaties Made, Treaties Broken."
+ Egan, Timothy (25 June 2000). "Mending a Trail of Broken Treaties". The New York Times. Retrieved 17 September 2016.
+ DeLoria, Jr., Vine (2010). Behind the Trail of Broken Treaties: An Indian Declaration of Independence. University of Texas Press. ISBN 978-0-292-70754-2. Entire book is dedicated to examining these broken treaties.
+ Wildenthal, Bryan H. (2003). Native American Sovereignty on Trial: A Handbook with Cases, Laws, and Documents. ABC-CLIO. p. 122. ISBN 1-57607-625-3. The field of Indian law rests mainly on the old treaties.
+ Charles C. Royce
+ U.S. Serial Set
+ Page 648 US Serial Set, Number 4015, 56the Congress, 1st Session
+ Hundreds of Native American Treaties Digitized for the First Time Smithsonian Magazine 2020 October 15
+ National Archives and Museum of Indian Arts & Culture Share New Online Education Tool Expanding Access to Treaties between the U.S. and Native Nations. Blog of the Archivist of the United States. 2020 October 13
+ Kappler, Charles J. (1904). "Indian Affairs Laws and Treaties - Acts of Forty-third Congress - First Session 1874 - Chapter 136". Archived from the original on February 28, 2001.
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