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United States v. Louisiana, 394 U.S. 1 (1969)

United States v. Louisiana (Texas Boundary Case)

No. 9, Orig.

Argued November 18, 1968

Decided March 3, 1969

394 U.S. 1


Section 2(b) of the Submerged Lands Act of 1953 confines the gulfward boundary of submerged lands granted by the Act to not more than three marine leagues from the "coast line," which Texas contends refers to the coastline as it existed in 1845, when Texas entered the Union.

Held: The Convention on the Territorial Sea and the Contiguous Zone, whose definitions have been adopted by the Court for purposes of the Submerged Lands Act (United States v. California, 381 U. S. 139) defines "coast line" as the modern, ambulatory coastline resulting from erosion and accretion, and it is from that line that Texas' gulfward boundary must be measured. Pp. 394 U. S. 2-6.

Page 394 U. S. 2

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