Roberts County and Grant County in South Dakota developed out of earlier county boundaries and the Sisseton Reservation, in a region long home to the Sisseton, Wahpeton, and Cuthead Yanktonaise Sioux. In 1862 the area was part of Deuel and Cheyenne Counties, and in 1867 the Reservation, extending south to Lake Kampeska in a giant flatiron, was established. Grant County was created in 1873 from Deuel County, later losing its southwest corner to Codington in 1879 and its northern part to Roberts County in 1883. Roberts County, named for S. G. Roberts, was created in 1883 from the part southeast of the Reservation that had belonged to Grant County from 1873 to 1883. Roberts County was organized on August 6, 1883, by Frederick Dittes, Charles Crissey, Indian Agent, and Reuben R. Hall, and Travare, two miles southwest of Browns Valley, was named county seat. In 1884 Wilmot won the election for county seat, but after losing two court actions, stole the records and was named county seat by the 1885 legislature; in 1898 it lost an election to Sisseton, which, fearing court action, also stole the records and again won approval in the 1900 election. White settlement on the Reservation came in 1892, and the railroad reached Sisseton in 1893. Roberts County post offices included Sisseton Agency in 1872, Wilmot in 1881, White Rock in 1885, Corona in 1886, Summit, Sisseton, and Effington in 1892, and Rosholt, Victor, Hammer, and Claire City in 1914, when the Soo Line entered the county. Grant County was named for U. S. Grant and was part of Deuel County from 1862 until its creation in 1873. Its first settlers were Moses Mireau and Solomon Robar near present Big Stone in 1865, followed by Louis Shoreau and Oliver Martell in 1871, Levi Card at Yellowbank in 1874, John Blake and Ludwig Reischka in Whetstone Valley, and James G. Lamoreau near present Marvin in 1877. In 1873 Mireau, Shoreau, and Martell were appointed commissioners but failed to act, and on February 8, 1878, Judge Shannon made William R. Movious, postmaster at Inkpa City since June 30, 1875, county clerk. Governor Howard appointed Card, Lamoreau, and Robar commissioners, and they organized the county at Inkpa City on June 17, 1878. In the election of 1881, Milbank fell 13 votes short of two-thirds, but soon got part of the records by force and failed to get the rest by stealth; on February 21, 1883, the court made Milbank the county seat. Granville, with Geo. W. Bartlett as postmaster on December 4, 1879, became Milbank on August 19, 1880, when the railroad arrived, and other towns included Twin Brooks in 1879, Troy in 1880, Marvin, Revillo, and Stockholm in 1884, Strandburg in 1888, Albee in 1889, and La Bolt in 1899.