The article you quoted had that information published with it. It wasn't quoted tho. Thought the whole article should be in. links http://www.bia.gov//FAQs/index.htm - -The link will tell you why the tribes are granted the status they are. While your there,you can wander and find the upgraded recognition of the Seneca/Cayugas. Their is a second "digital" link to the treaties on the page. second link has the treaties. Hopefully,this will educate others who have all these questions,that have been asked for the past decade.