The Southwestern Historical Quarterly, Volume 62, July 1958 - April, 1959 Page: 167
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The United States-Mexican Boundary Survey
tenant W. H. Emory, had reported existed somewhere along the
Gila River. All of these objectives commanded Trist's serious
attention for upon their fulfillment depended the cessation of
Article V of the treaty as concluded declared that the boundary
line should run from a point three leagues out in the Gulf of
Mexico up the Rio Grande along its deepest channel to the point
where the river struck the southern boundary of New Mexico.
From this point it ran westerly along the whole southern bound-
ary of New Mexico, "which runs north of the town called Paso"
[present Juarez], to its western termination, and thence north-
ward along the western line of New Mexico until it intersected
the first branch of the Gila River, or to the point on the line
nearest such branch, and then down it to the Gila, down the Gila
to the Colorado, and then in a straight line to a point on the
Pacific Ocean. The terminal point on the Pacific Ocean was to
be one marine league south of the southernmost point of the port
of San Diego as laid down in the 1782 map of Juan Pantoja,
second sailing master of the Spanish fleet, published in 1802 in
the atlas to the voyages of the schooners Sutil and Mexicana.3
The southern and western limits of New Mexico were those
specified in J. Disturnell's "Map of the United Mexican States,
as organized and defined by various acts of the congress of said
republic, and constructed according to the best authorities. Re-
vised edition. Published at New York in 1847." This map was
known, at the time, to be inaccurate, but was nevertheless in-
cluded as an arbitrary definition of the limits of New Mexico.'
Even the two copies of the map attached to the treaties were not
identical, the American copy being the seventh edition, and the
Mexican copy the twelfth edition.5 All versions of Disturnell's
2William R. Manning, Diplomatic Correspondence of the United States: Inter-
American Affairs, z831-x86o (12 vols.; Washington, 1932-1939), III, o1044-10o49.
3Senate Executive Documents, 3oth Cong., 1st Sess. (Serial No. 509), Document
No. 52, pp. 43-45-
'William H. Emory, "Report on the United States and Mexican Boundary Sur-
vey," House Executive Documents, 34th Cong., 1st Sess. (Serial No. 861), Docu-
ment No. 135, p. 21; undated Trist draft of letter to New York Evening Post (MS.,
Nicholas P. Trist Papers, Library of Congress), XXXIV, June 20, 1849-February 23,
GLaurence Martin, Disturnell's Map (Washington, 1937), 353.
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 62, July 1958 - April, 1959, periodical, 1959; Austin, Texas. (texashistory.unt.edu/ark:/67531/metapth101173/m1/209/: accessed February 22, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.