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7 Stat.
The townsite was ceded by the Treaty of Chicago of 29 August 1821 — Royce Area 117 — the same instrument that takes South Bend, Mishawaka and Granger, and not any of the later instruments that take the county's southern places. The verdict is plotted, not presumed, and the plot is stated whole. On the Royce Schedule mapping (the federal Tribal Cession Lands layer), the town's 2020 gazetteer point — 41.717607° N, −86.250592° W — returns Area 117 and only 117. A six-by-six grid of test points across the town's whole bounding box, 36 cells, returns 117 in every cell: the entire town, with margin, lies inside the one cession. The control plots reproduce the county sequence's settled verdicts exactly — the South Bend point returns 117, the Granger point 117, the North Liberty point 180, the Lakeville point 146 — so the instrument that returns 117 for Roseland is the instrument the framework itself is plotted on.
From the treaty's own calls (read first-hand, Kappler): the 1821 cession's southern boundary in Indiana is "a line drawn due east from the southern extreme of Lake Michigan" — the line the later instruments call the line run in 1817 — and the polygon lies wholly north of that line, running east to the former cessions, up to the Grand River, down it to Lake Michigan, and back along the shore and the south bank of the St. Joseph to the beginning. Roseland, some seven miles north of that line, falls inside on the north–south limb by a wide margin. The instrument's date and parties as the Schedule record carries them: Treaty of Chicago, 29 August 1821, the Ottawa, Chippewa and Potawatomi nations, proclaimed 25 March 1822.