Several factors can be attributed to the Spaniards conquest against the Mexican. However, the most significant factor that led to this conquest was the coalition of Spanish forces. Spanish forces got reinforcement from a number of rivals of the Aztec Empire. The rivals who offered support to the Spanish included Totonacs and the Tlaxcaltecas. The Spanish army coalition had the numbers in their favor besides the superior weapons which helped them a great deal to conquer the Spaniards (Lockhart, 2004). The Mexican on the other hand used inferior weapons which could not counter Spanish weapons. The Spanish coalition of forces was headed by one Herna Cortes; he was a shrewd and fearless leader who came up with superior strategy that finally handed them victory against the Mexicans.
In the face of the battle, the Spanish soldiers used trickery to ambush their opponents. The superiority of Spanish soldiers came into play when Cortes captured Aztecs Emperor and ruled through him from his own palace (Restall, 2008). The Mexicans did not go down without a fight, they put up a spirited war against the invasion of the Spaniards but to no avail. Every time it appeared like the Mexicans were getting an edge in the war, the Spanish forces sorted for reinforcement which helped them to conquer the Mexicans eventually. Hassig (2004) says that the collapse of the Empire of Aztec was a good stepping stone for Spain because it helped them to acquire new territories. At the end of the conquest, the Spain would claim Aztec Empire in the formation of New Spain. The fact that Spain got reinforcement from the rivals of the Aztec Empire ensured that they got a good grounds to mount a successful conquest against the Mexican.
References
Lockhart, J. (2004). We People Here: Nahuatl Accounts of the Conquest of Mexico. Eugene, Oregon: Wipf and Stock.
Restall, M. (2008). Seven Myths of the Spanish Conquest. New York: Oxford University Press
Hassig, R. (2004). Mexico and the Spanish Conquest. London and New York: Longman.