Why did the aztec city of tenochtitlán become one of the richest cities in the
world?
a. the richest residents of all the nearby cities came to settle in
tenochtitlán.
b. tenochtitlán became the center of the lucrative mesoamerican
gold-silk trade.
c. the aztecs discovered gold deposits just below the surface of
tenochtitlán's central lake.
d. the aztecs used tributes from conquered peoples to build
tenochtitlán into an impressive city.