Why were the Inca considered a advanced civilization?

When was The Treasury at Petra Jordan created? Did ancient egyptians create gunpowder? Where does the name Rhiannon come from? History of watches in marathi language? What did Telemachus and Peisistratus take with them? What is a faun in Greek mythology and what role do they play in the ancient Greek stories? Who is Aphrodites father? How was Eurydice killed? Why would the hearth be sacred to the Aztecs? The developments in the cotton and iron industries made France the leading industrial country until the end of the nineteenth century? What was the 'compluvium' in an ancient Roman house? How many people died at the Coliseum? Where did the word Mediterranean come from? Was the Inca empire wealthy? What wars was Cleopatra involved in? What does Penelope reprimand Telemachus for? What is the word origin for transform? Why was Achilles a hero? What were the first and second great inventions of southern Mesopotamia? What were the differences between the rich and poor Egyptians?