[Dan Nunn]

I don't quite know what you mean by 'race-baiters' but it sounds like something I'd be called because of my opposition to Obama. Anyway, you can choose to ignore the 1794 Treaty of Canandaigua signed by George Washington's agent, but here is what the United States agreed to, specifically (as it relates to the Senecas):

ARTICLE 2. The United States acknowledge the lands reserved to the Oneida, Onondaga, and Cayuga Nations in their respective treaties with the State of New York, and called their reservations, to be their property; and the United States will never claim the same, nor disturb them, or either of the Six Nations, nor their Indian friends, residing thereon, and united with them in the free use and enjoyment thereof; but the said reservations shall remain theirs, until they choose to sell the same to the people of the United States, who have the right to purchase.

[Behind Liberal Lines]

Your citation doesn’t reference the Senecas, only “the Oneida, Onondaga, and Cayuga Nations.” And at least two of those tribes (Oneida and Cayuga) have been found to have lost their reservations. See the Sherrill decision and the Court of Appeals decision Cayuga Indian Nation v Pataki.