What are the reasons the Aztec and Incas were declined?

Could women in ancient times go to the Colosseum? When were coins invented? What are phaeton's symbols in greek mythology? Which event did Athena play a part in? Did the Celts trade? Were there many merchants in Sparta? Did tryphaena have a sister named Cleopatra? How does odyssey relate to Homer's epic and the hero Odysseus? What is interesting about Athena? What type of mythological creature was polyphemus? Who designed the anc logo? Did Cleopatra overcome obsticles? What was life like for a helot? What is marios job before he became a plumber? What was an ancient Greek challenge? What is Achilles greatst contribution to the trajon war? Which was not important early religion belief in ancient china? How did the ancient greek have an influence on the world? Why do campers burn their food for the gods? In what present day countries were the Aztec and the Inca Empire's located?