A nation reassembled in a strange country
The Seminole had not lived in Florida as a single, unified people for centuries before removal; the nation had coalesced from Creek emigrants, escaped enslaved people, and indigenous Florida communities across the eighteenth century. That origin mattered enormously when the United States began forcing removals in the 1830s. Three separate wars — the costliest the federal government fought against any indigenous nation in that period — failed to remove everyone, but they removed most. The people who arrived in Indian Territory in the late 1830s and early 1840s were the ancestors of the Seminole Nation of Oklahoma, reconstituting themselves under duress in land assigned first within the Creek Nation's boundaries, because the government had not allocated them a separate domain at all.
That arrangement lasted until 1856, when a new treaty finally gave the Seminole their own territory — a tract west of the Creek Nation, in what is now central Oklahoma. It was the smallest land base of any of the five nations, and it came late, after years of the Seminole living as guests within Creek jurisdiction. The boundary lines drawn then gave the nation roughly two million acres. What remained after the allotment era was a fraction of that.
The Civil War tore through the Seminole with particular violence. The nation split, as all five nations did, between those who supported the Confederacy and those who remained loyal to the Union. A large portion of the Unionist Seminole — led by Opothleyahola, a Creek-Seminole leader whose name appears in multiple spellings — fled north toward Kansas in the winter of 1861, suffering severe casualties from cold and Confederate pursuit. The 1866 reconstruction treaty that followed punished the whole nation regardless of allegiance, requiring the cession of their entire existing territory and the recognition of formerly enslaved Seminole as full citizens of the nation — the most generous provision of any reconstruction treaty with the five nations, and one the Seminole kept.

The Dawes Act of 1887 and the Curtis Act of 1898 dismantled the Seminole's communal land title along with that of the other four nations, enrolling individuals on the Dawes Rolls and converting national land to individual allotments. The Seminole Nation of Oklahoma was reconstituted under the Oklahoma Indian Welfare Act of 1936 and continues to function as a sovereign government. Its land base today is modest; its governmental continuity across two forced removals, a civil war and a federal allotment campaign is not.

