How did the muslim caliphates affect early north african civilizations?
a. they pohibited the slave trade in north africa and arabia.
b. they set up an effective trade network linked to india and china. c. they strictly controlled access to african gold mining regions. d. they organized a decentralized system of government.

Which statement best describes a significant cause of world war ii? o a. the economic boom that followed world war i allowed countries to build up huge militaries. o b. the treaty of versailles, which ended world war i, left lasting resentments in many countries. o c. the rise of imperial states in asia caused european powers to unite for their common defense. o d. the league of nations encouraged european states to form secret military alliances.