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

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?

World war 2 was caused, in part, by which of these factors?

Where did the term “iron curtain” originate? the warsaw pact used the term iron curtain as a code word for communism. in a 1946 speech, british prime minister winston churchill said an iron curtain had fallen across the continent of europe. while visiting western europe in 1946, u. s. president harry truman commented that the mountains there looked like iron curtains. russian general secretary joseph stalin instructed citizens of eastern europe to hang iron curtains over their windows to protect themselves from stray bullets.