But there are those who, conceding all this to be true, assume the
ground that the true western boundary of Texas is the Nueces instead of
the Rio Grande, and that therefore in marching our Army to the east bank
of the latter river we passed the Texan line and invaded the territory
of Mexico. A simple statement of facts known to exist will conclusively
refute such an assumption. Texas, as ceded to the United States by
France in 1803, has been always claimed as extending west to the Rio
Grande or Rio Bravo. This fact is established by the authority of our
most eminent statesmen at a period when the question was as well, if not
better, understood than it is at present. During Mr. Jefferson's
Administration Messrs. Monroe and Pinckney, who had been sent on a
special mission to Madrid, charged among other things with the
adjustment of boundary between the two countries, in a note addressed to
the Spanish minister of foreign affairs under date of the 28th of
January, 1805, assert that the boundaries of Louisiana, as ceded to the
United States by France, "are the river Perdido on the east and the
river Bravo on the west," and they add that "the facts and principles
which justify this conclusion are so satisfactory to our Government as
to convince it that the United States have not a better right to the
island of New Orleans under the cession referred to than they have to
the whole district of territory which is above described.
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