July 29, 1861
Hon. H. HAMLIN,
President of the Senate .
Sir: I transmit herewith, to be laid before the Senate for its constitutional action thereon, articles of agreement and convention,* with accompanying papers.
ABRAHAM LINCOLN.
*With confederated tribes of Arapahoe and Cheyenne Indians of the Upper Arkansas River.
Abraham Lincoln, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/203186