Even more important, there were signs that a monarchy headed by a European prince might be set up in Mexico, involving dangerous interference in our commercial and political relations with that country, sure to increase the gravity of a military contest, should one arise, and seriously attacking the "Monroe Doctrine." As early as 1838 our consul at Mexico reported that Alamán and the conservatives were laboring to establish a monarchy. In 1840 Estrada, one of the ablest and best of their statesmen, was denounced for openly advocating the change. Paredes, now at the head of the army, had favored it for years, and in 1841 had initiated a movement in that direction. In January, 1845, two agents of the Spanish government were said to be laboring in Mexico for the same cause, and the _Memorial Histórico_ announced that Spain, France and England had formed an alliance to set up a new government there. At about the same time the _Picayune_ stated that official documents relating to the monarchical scheme had been received at New Orleans; and early in March our diplomatic representative at London sounded a strong note of warning.[4.15] To reinforce all these considerations, England and France felt deeply offended at our absorption of Texas; Polk, who believed "that no compromise [in the Oregon affair] to which Great Britain would accede, could pass the Senate," now regarded a peaceful adjustment of that controversy as impossible; and Mexico, though as a rule profoundly influenced by the policy of England, might any day take offence at some British move, and wish to approach the United States. For these reasons it was of great importance to have a diplomatic agent near her government ready to take advantage of any promising turn; and, finally, one can easily imagine that in Polk's opinion the reception of a United States minister would of itself, aside from what he might do, render it more difficult for Mexico to maintain her unfriendly attitude.[4.16] [SLIDELL DESPATCHED AS MINISTER]