The islamic world experienced a dark period during the 1200s and 1300s. what was the principal cause of the islamic world’s hardships?
a. muslim nobles subjected most muslims to a miserable, difficult life of serfdom.
b. european crusaders, attempting to win back jerusalem, enslaved most of the muslim world.
c. mongol armies from central asia repeatedly invaded and conquered parts of the muslim world.
d. christians from the byzantine empire continually tried to convert them to christianity.

was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south

c. free trade can lead to low pay for workers in poorer countries.