How did the introduction of diseases by the Europeans affect the Spanish conquest of the Aztec?
A. Indigenous Americans had not been exposed to the diseases before and their immune systems could not tolerate the illnesses, benefiting the Spanish forces.
B. Although diseases weakened forces on both sides considerably, deaths from illness were few.
C. After Aztec forces were weakened by disease, they joined with the Totonac and Tlaxcalans to fight against the Spaniards.
D. The spread of disease slowed the progression of battles between the Spaniards and the Aztec.