I really want to know exactly and precisely what happened in the area in and around present day Mexico City after Spanish conquest, but so far all the sources available online for free only give a very murky picture that answer none of my biggest questions that I am looking for answers to. I have a feeling the books are not going to be anymore clear.
Why is this the case? Weren’t there a lot of Spanish people keeping track of everything and writing things down in Spanish in the lands they conquered ?
By comparison , it seems the history of English colonization of North America seems to be very well documented down to the smallest detail.
Some really big questions I have about the consequences of the conquest of the Aztec are:
Did the Native Americans ever grow to view the Spanish as a common enemy and band together to try to drive them out? If yes, why were they not successful?
How did the “Mestizo” racial mix become the dominant mix in present day Mexico if so many Native Americans were dying from smallpox and the amount of Spanish people in Mexico was always so low?
How did the Spanish go about mixing with the Native Americans? Were Native American women simply kidnapped and made into brides? Or did the majority of Native American women voluntarily entered into relationships with the Spanish?
Did the allies of the Spanish in the war against the Aztec feel betrayed after they lost special privileges soon after the conquest was complete? Did they revolt against the Spanish when this became apparent ?
After conquering the Aztec , how were the Spanish able to maintain control of the region if their numbers were so low all the time ?
You've asked a lot of different questions here.
I will begin by citing the work of /u/drylaw, who has previously answered Did the Spanish in the New World ever try to undermine/downplay the potentially subversive legacies of the more advanced and powerful peoples they conquered? and How was Tlaxcala governed after Cortes' arrival? Drylaw has also contributed to the section of the FAQ about mestizaje.
/u/anthropology_nerd has previously written a series of posts for /r/badhistory about the Myths of Conquest and answered in great detail the question Why were Native Americans not enslaved? because it rests on a false premise. Please read the nine-part series carefully, as it may address some of your underlying assumptions, especially about smallpox.
/u/400-rabbits has previously answered
The three flairs I have pinged may have more to say or other prior answers to link.