Reservation establishment refers to the process by which specific areas of land are set aside by the federal government for the exclusive use and governance of Native American tribes. This practice emerged primarily in the 19th century and aimed to confine Indigenous peoples to designated territories while regulating their interactions with non-Native populations. The establishment of reservations is closely tied to treaties, policies, and the trust relationship between Native American tribes and the federal government, reflecting a complex history of sovereignty, land rights, and cultural preservation.