William McKinley actually said...
By virtue of the power in me vested by section twenty-four of the aforesaid act of Congress, do hereby make known and proclaim that there are hereby reserved from entry or settlement and set apart as Public Reservations all those certain tracts, pieces, or parcels of land lying and being situate in the State of Montana
Context
Proclamation 430—Setting Apart as Public Reservations Certain Public Lands in the State of Montana
02/09/1899