Update README.md

Made clear the information was originally compiled on Wikipedia

README.md

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+ORIGINALLY COMPILED ON WIKIPEDIA. Cleaned and improved from original version on Wikipedia, by completing some column information that was available elsewhere in the wikipedia article.
 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.
 
 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]