Which chinese sailor began a series of seven naval expeditions that went as far as te east coast of africa?
a. mongke
b. zheng he
c. berke
d. hulegu

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.

Why was the agricultural revolution more successful in england than in the rest of europe?

Which is an effective question for launching history inquiry related to the cold war