Summary

Portrait of John Marshall Harlan II John Marshall Harlan II United States v. Louisiana — Opinion of the Court

A land boundary between two States is an easily understood concept. It marks the place where the full sovereignty of one State ends and that of the other begins. The concept of a boundary in the sea, however, is a more elusive one. The high seas, as distinguished from inland waters, are generally conceded by modern nations to be subject to the exclusive sovereignty of no single nation.
Source: Wikisource

Portrait of John Marshall Harlan II John Marshall Harlan II United States v. Louisiana — Opinion of the Court

We have already held with respect to Louisiana's claim to a three-league maritime boundary that an Act of Admission which refers to all islands within a certain distance of the shore does not appear on its face to mean to establish a boundary line that distance from the shore, including all waters and submerged lands as well as all islands. There is nothing in Mississippi's history, just as there is nothing in Louisiana's, to cause us to depart from that conclusion in this instance.
Source: Wikisource

Portrait of John Marshall Harlan II John Marshall Harlan II United States v. Louisiana — Opinion of the Court

The extent to which a nation can extend its power into the sea for any purpose is subject to the consent of other nations, and assertions of jurisdiction to different distances may be recognized for different purposes. [60] In a manner of speaking, a nation which purports to exercise any rights to a given distance in the sea may be said to have a maritime boundary at that distance. But such a boundary, even if it delimits territorial waters, confers rights more limited than a land boundary.
Source: Wikisource

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