While he thus disgusted his subjects by his haughty deportment, he alienated their affections by the imposition of grievous taxes. These were demanded by the lavish expenditure of his court. They fell with peculiar heaviness on the conquered cities. This oppression led to frequent insurrection and resistance; and the latter years of his reign present a scene of unintermitting hostility, in which the forces of one half of the empire were employed in suppressing the commotions of the other. Unfortunately, there was no principle of amalgamation by which the new acquisitions could be incorporated into the ancient monarchy as parts of one whole.{*} Their interests, as well as sympathies, were different. Thus the more widely the Aztec empire was extended, the weaker it became; resembling some vast and ill-proportioned edifice, whose disjointed materials, having no principle of cohesion, and tottering under their own weight, seem ready to fall before the first blast of the tempest. {*} [They were held as subject pueblos. See note, p. 23, vol. i.--M.] In 1516 died the Tezcucan king, Nezahualpilli; in whom Montezuma lost his most sagacious counsellor. The succession was contested by his two sons, Cacama and Ixtlilxochitl. The former was supported by Montezuma. The latter, the younger of the princes, a bold, aspiring youth, appealing to the patriotic sentiment of his nation, would have persuaded them that his brother was too much in the Mexican interests to be true to his own country. A civil war ensued, and ended by a compromise, by which one half of the kingdom, with the capital, remained to Cacama, and the northern portion to his ambitious rival. Ixtlilxochitl became from that time the mortal foe of Montezuma.[5] A more formidable enemy still was the little republic of Tlascala,{*} lying midway between the Mexican Valley and the coast. It had maintained its independence for more than two centuries against the allied forces of the empire. Its resources were unimpaired, its civilization scarcely below that of its great rival states, and for courage and military prowess it had established a name inferior to none other of the nations of Anahuac. {*} [Tlascala was not a republic but a pueblo. It was divided into four phratries. Clavigero says (Storia Ant. del Messico, tom. i. p. 155) that it was divided into four parts, each division having its lord.--M.]