Final answer:
After the conquest of the Aztec people by Spanish conquistadors, much of the evidence of Aztec culture was lost. The Spanish destroyed many Aztec artifacts, and the Aztecs themselves also destroyed some of their own artifacts to prevent their advanced knowledge from falling into the hands of the Spanish.
Step-by-step explanation:
After the conquest of the Aztec people by Spanish conquistadors, much of the evidence of Aztec culture was lost. The Spanish destroyed many Aztec artifacts, including their knowledge of astronomy, calendars, and engineering technology. Only about 5% of the Aztec world remains today, and most of the known information comes from Spanish chronicles and records. The Aztecs themselves also destroyed some of their own artifacts to prevent their advanced knowledge from falling into the hands of the Spanish.