What factors led to the fall of the Aztec civilization?

There were many factors but I would say the biggest one's would include disease, the Spanish conquest, and human sacrifices that took a toll on the Aztec population.

that is because lower interest rates allowed people to work harder to make money. it multiplied like that and now the uno(not the game) is very strong.

i like trains

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.