Soon after his arrival at New Orleans Burr seems to have formed bolder designs. From this time we find in his correspondence, and that of his friends, vague hints of some great undertaking. This proved to be a project for an expedition against Mexico, and the establishment there of an Empire which was to include the States west of the Alleghanies; subsidiary to this, and connected with it, was a plan for the colonization of a large tract of land upon the Washita.
It is difficult to believe that a design so absurd can have been entertained by a man of common sense; yet it is certain that it was seriously undertaken by Burr. His conduct in carrying it out furnishes the best measure of his talents and a signal exhibition of his folly and his vices. His high standing, his reputation as a soldier, attracted the vulgar, and brought him into intercourse with the most intelligent people of the Territory. The fascination of his manners, and the skill in the arts of intrigue which long discipline had given him, enabled him to sustain the impression which the prestige of his name everywhere produced. The details of his political conduct could not have been accurately known in a region so remote. The affair with Hamilton had not injured his reputation in communities where such affairs were common and often applauded. The circumstances of the time, to his superficial glance, seemed to be encouraging. A large portion of the country had lately passed under our flag;--many of the inhabitants spoke a foreign language, and retained foreign customs and predilections;--the American settlers were an adventurous race, and eager for an opportunity to indulge their martial spirit;--Mexico was uneasy under the Spanish yoke;--and some indications of a war between the United States and Spain held out a faint hope that the initiatory steps of his enterprise might be taken with the connivance of the government. To recruit an army among the hardy citizens of Kentucky and Tennessee, to excite the jealousies of the French in Louisiana, to subdue feeble and demoralized Mexico, and create a new and stable empire, did not appear difficult to the sanguine imagination of a man who was without means or powerful friends, and who at no time had sufficient confidence in those with whom he was engaged to fully inform them of his plans. But he pursued his purposes with a tenacity which leaves no doubt of his sincerity, and an audacity and unscrupulousness seldom equalled. A few whom he thought it safe to trust were admitted to his secrets. Upon those in whom he did not dare to confide he practised every species of deception. He told some, that his intentions were approved by the government,--others, that his expedition was against Mexico only, and that he was sure of foreign aid. He represented to the honest, that he had bought lands, and wished to form a colony and institute a new and better order of society; the ignorant were deluded with a fanciful tale of Southern conquest, and a magnificent empire, of which he was to be king, and Theodosia queen after his death. So thoroughly was this deception carried out, that it is difficult to determine who were actually engaged with him. Without doubt, many acceded to his plans only because they did not knew what his plans really were. He made rapid journeys from New Orleans to Natchez, Nashville, Lexington, Louisville, and St. Louis. In the winter of 1805 he returned to Washington, and in the following summer again went down the Ohio. Wherever he went, he threw out complaints against the government,--charged it with imbecility,--boasted that with two hundred men he could drive the President and Congress into the Potomac,--freely prophesied a dissolution of the Union, and published in the local journals articles pointing out the advantages which would result from a separation of the Western from the Eastern States. Gen. Eaton had been denounced in Congress, and had a claim against the government; Burr tempted him with an opportunity to redress his wrongs and satisfy his claim. Commodore Truxton had been struck from the Navy list; he offered him a high command in the Mexican navy. He took every occasion to flatter the vanity of the people; attended militia parades, and praised the troops for their discipline and martial bearing. Large donations of land were freely promised to recruits; men were enlisted; Blennerhassett's Island was made the rendezvous; and provisions were gathered there.