sentences:  When settlers from the east began to arrive in south Arkansas, the land was inhabited by the indigenous tribe known as the Quapaw.The earliest cession of territory was made in 1818, with a later boundary against the neighboring Choctaw tribe in 1820, opening up the southeastern corner of the Arkansas Territory for settlement.Although the area had been settled by European-Americans for approximately thirty years, the city itself was not incorporated until 1851.