Arriving from the north in the seventh century the Toltecs had overspread the plateau of Anahuac. They were an intelligent race of people, addicted to agriculture and the mechanical arts, understanding the working in metals, and to whom is due the construction of the greater part of the sumptuous and gigantic edifices of which the ruins are found in every direction in New Spain. After four centuries of power, the Toltecs disappeared from the country as mysteriously as they had come. A century later they were replaced by a savage tribe from the north-west, who were soon followed by more civilized races, speaking apparently the Toltec language. The most celebrated of these tribes were the Aztecs, and the Alcolhuès or Tezcucans, who assimilated themselves easily with the tincture of civilization which remained in the country with the last of the Toltecs. The Aztecs, after a series of migrations and wars, settled themselves in 1326 in the valley of Mexico, where they built their capital Tenochtitlan. A treaty of alliance both offensive and defensive was entered into between the states of Mexico, Tezcuco, and Tlacopan, and was rigorously observed for a whole century; in consequence of this the Aztec civilization, which had been at first bounded by the extent of the valley, spread on all sides, and soon was limited only by the Pacific and Atlantic Oceans. In a short time these people had reached a higher degree of civilization than any other tribe in the New World. The rights of property were recognized in Mexico, commerce flourished there, and three kinds of coin in circulation provided the ordinary mechanism of exchange. There was a well-organized police, and a system of relays which worked with perfect regularity, and enabled the sovereign to transmit his orders with rapidity from one end of the empire to the other. The number and beauty of the towns, the great size of the palaces, temples, and fortresses indicated an advanced civilization, which presented a singular contrast to the ferocious manners of the Aztecs. Their polytheistic religion was in the highest degree barbarous and sanguinary; the priests formed a very numerous body, and exercised great influence even over political affairs. Side by side with rites similar to those of Christians, such as baptism and confession, the religion presented a tissue of the most absurd and bloody superstitions. The offering up of human sacrifices, adopted at the beginning of the 14th century, and used at first very sparingly, had soon become so frequent, that the number of victims immolated each year, and drawn chiefly from the conquered nations, amounted to 20,000, while under certain circumstances the number was much larger. Thus in 1486, at the inauguration of the temple of Huitzilopchit, 70,000 captives perished in a single day.
The Government of Mexico was monarchical; at first the imperial power had been carefully limited, but it had increased with the various conquests, and had become despotic. The sovereign was always chosen out of the same family, and his accession was marked by the offering up of numerous human sacrifices. The Emperor Montezuma belonged to the sacerdotal caste, and in consequence his power received some unwonted development. The result of his numerous wars had been the extension of his frontiers, and the subjugation of various nations; these latter welcomed the Spaniards with eagerness, thinking that their dominion must surely be less oppressive and less cruel than that of the Aztecs.
It is certain that if Montezuma, with the large force which he had at his disposal, had fallen upon the Spaniards when they were occupying the hot and unhealthy shore of Vera-Cruz, they would have been unable, in spite of the superiority of their arms and discipline, to resist such a shock; they must all have perished, or been obliged to re-embark, and the fate of the New World would have been completely changed. But the decision which formed the most salient point in the character of Cortès, was completely wanting in that of Montezuma, a prince who never could at any time adopt a resolute policy.
Fresh ambassadors from the emperor had arrived at the Spanish camp, bringing to Cortès an order to quit the country, and upon his refusal all intercourse between the natives and the invaders had immediately ceased. The situation was becoming critical, and this Cortès felt. After having overcome some hesitation which had been shown by the troops, he laid the foundations of Vera-Cruz, a fortress designed to serve as a basis of operations, and a shelter in case of a possible re-embarkation. He next organized a kind of civil government, a junta, as it would be called in the present day, to which he resigned the commission which had been revoked by Velasquez, and then he made the junta give him one with new provisions and more extended powers. After this he received the envoys from the town of Zempoalla, who were come to solicit his alliance, and his protection against Montezuma, whose dominion they bore with impatience. Cortès was indeed fortunate in meeting with such allies so soon after landing, and not wishing to allow so golden an opportunity to slip, he welcomed the Totonacs kindly, went with them to their capital, and after having caused a fortress to be constructed at Quiabislan on the sea-shore, he persuaded his new friends to refuse the payment of tribute to Montezuma. He took advantage of his stay at Zempoalla to exhort these people to embrace Christianity, and he threw down their idols, as he had already done at Cozumel, to prove to them the powerlessness of their gods.