In which area was islam spread most quickly using trade routes in the 8th and 9th centuries? a) north africa b) eastern europe c) western china d) sub-saharan africa 12) though the incas lacked wheeled tools and draft animals, their economy was based primarily on a) engineering. b) farming. c) mining. d) transportation. 13) the koran is the sacred book of what religion? a) buddhism b) christianity c) hinduism d) islam 14) the aztecs built a powerful and wealthy empire by a) militarily conquering other tribes and making alliances. b) using gold and silver to control mesoamerican trade. c) destroying their toltec and mayan rivals. d) allying with the spanish conquistadors. 15) historically, kingdoms in northern africa were able to attain great wealth by controlling the trans-saharan trade of what biologically important