Which person was emperor of the Yuan Dynasty who welcomed the Italian traveler Marco Polo to his court?

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

Who led the continental army in the final decisive battle of the revolutionary war at yorktown

American indians in the blank built longhouses options -north west -great plains -south east -eastern woodlands q#2 american indians in the blank celebrated with a potlatch options same as before!