Arkansas v. Tennessee

Background

The States of Arkansas and Tennessee disputed ownership of land known as Needham’s Cutoff (also called Cutoff Island or Moss Island) and an adjacent formation called Blue Grass Towhead. In 1821 the Mississippi River suddenly changed course (an avulsion), so the original channel filled and the land became physically attached to the eastern shore. A Special Master investigated the facts after the States filed competing claims; the parties agreed to resolve the second count by stipulation, leaving the Cutoff Island area in dispute.

Reasoning

The core question was whether the original river-based boundary or Tennessee’s long exercise of authority controlled who owned the land. The Master found Tennessee had openly exercised government functions there from about 1826 onward—taxes, voting, surveys, court process and a Tennessee tax sale—while Arkansas had not asserted control. The Court relied on long-standing decisions saying that long, uninterrupted possession and the other State’s acquiescence can fix a boundary. Because Tennessee had consistently exercised authority and Arkansas acquiesced, the Court accepted the Master’s conclusion that Tennessee now holds the land, and it set the boundary at the middle of the Mississippi’s main channel as it existed when the complaint was filed.

Real world impact

The decision awards the disputed island and the newly formed Blue Grass Towhead to Tennessee and requires marking the agreed boundary line with physical markers. The Court divided costs equally between the States. The ruling resolves the boundary dispute between these States based on long possession and public exercise of jurisdiction rather than on a contest over United States land title.