Caleb Blood Smith, a career politician, was appointed by Abraham Lincoln in March 1861 as Secretary of the Department of the Interior.
Later that same year, in his November Annual Report to President Lincoln, Secretary Smith wrote the following concerning the Apache and Pueblo nations:
“… as the Indians occupied that territory of both nations prior to the advent of the European race upon this continent, it seems clear that they held lands in the Territory of Mexico and the United States by precisely the same tenure. Be this as it may, the necessity that the Indians of this [southern] superintendency shall be concentrated upon suitable reservations is imperative. The rapid spread of our [white] population has reached this as well as our other Territories … the Indians in large and imposing numbers are in their midst … a constant source of irritation and vexation to the whites … To cure all these evils; to foster and protect our own settlements; to secure the ultimate perpetuity of the Territory, and a speedy development of its resources … [i.e. gold] … but one course is, in my judgement, left, and that is the concentration of the Indians upon ample reservations suitable for their permanent and happy homes, and to be sacredly held for that purpose.”
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Source: Caleb Blood Smith, Secretary of the Dept. of the Interior to President Abraham Lincoln, 27 November 1861, CIS U.S. Serial Set 1117, Microfiche #1117, 37th Congress, 2nd Session, Senate Ex. Doc. v.1, n.1., pp 633-637.