The terms of the treaty proposed by the United States were not only just to Mexico, but, considering the character and amount of our claims, the unjustifiable and unprovoked commencement of hostilities by her, the expenses of the war to which we have been subjected, and the success which had attended our arms, were deemed to be of a most liberal character. The commissioner of the United States was authorized to agree to the establishment of the Rio Grande as the boundary from its entrance into the Gulf to its intersection with the southern boundary of New Mexico, in north latitude about 32°, and to obtain a cession to the United States of the Provinces of New Mexico and the Californias and the privilege of the right of way across the Isthmus of Tehuantepec. The boundary of the Rio Grande and the cession to the United States of New Mexico and Upper California constituted an ultimatum which our commissioner was under no circumstances to yield. That it might be manifest, not only to Mexico, but to all other nations, that the United States were not disposed to take advantage of a feeble power by insisting upon wresting from her all the other Provinces, including many of her principal towns and cities, which we had conquered and held in our military occupation, but were willing to conclude a treaty in a spirit of liberality, our commissioner was authorized to stipulate for the restoration to Mexico of all our other conquests. As the territory to be acquired by the boundary proposed might be estimated to be of greater value than a fair equivalent for our just demands, our commissioner was authorized to stipulate for the payment of such additional pecuniary consideration as was deemed reasonable.