The Administration professed to credit this story, and Mr. Upshur wrote to General Murphy, the diplomatic agent of the United States in Texas, informing him of this communication from London, and arguing the double danger to the United States of British interference in Texas, and of the abolition of slavery there. This letter bears date of August 8th, 1843, and is considered as marking the beginning of the actual negotiations for annexation. It was certainly intended to prompt General Murphy to sound the Texan Government upon the question of annexation.
[Sidenote: The threat of the Mexican Government to consider the annexation of Texas a cause of war.]
[Sidenote: The Administration proposes annexation to the Texan agent.]
The Mexican Government evidently discovered the { 305} movement immediately, for, on August 23rd, the Mexican Secretary of State declared to Mr. Thompson, the Minister of the United States to Mexico, that the Mexican Government would consider any act of the United States to annex Texas as a declaration of war on Mexico. For seven years Mexico had made no war on Texas, though professing to regard the new state as only a rebellious province. In September of 1842, several marauding expeditions had crossed the Rio Grande, raided around for a few days, and then returned to Mexico. The Mexican Government called this a continuance of the war, and demanded that the states of the world should observe the attitude of neutrals toward a friendly Power engaged in suppressing a rebellion on the part of certain of its lawful subjects. This was absurd. From the point of view of international law Texas had won her independence, and might make what agreements she pleased with any other Power. The President paid no attention to the Mexican threat. On October 16th, 1843, Mr. Upshur formally proposed annexation to Mr. Van Zandt, and in his message to Congress, at the beginning of the session of 1843-44, the President indicated to Congress that the negotiations for annexation were in progress, and referred to the fact that Mexico threatened war in case the United States should resolve to annex Texas.
[Sidenote: The difficulty in the way of acceptance of the proposition.]
