November 25, 1803
To the Senate and House of Representatives of the United States:
The treaty with the Kaskaskia Indians being ratified with the advice and consent of the Senate, it is now laid before both Houses in their legislative capacity. It will inform them of the obligations which the United States thereby contract, and particularly that of taking the tribe under their future protection, and that the ceded country is submitted to their immediate possession and disposal.
TH: JEFFERSON.
Thomas Jefferson, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/203706