In history, what altered the development and population of sub-saharan africa?
a potato famine
the atlantic slave trade
a tsunami
a hurricane

What are new social classes emerged due to advancement in agriculture ?

"the plan of removing the aboriginal people who yet remain within the settled portions of the united states . . approaches its consummation. . an extensive region . . has been assigned for their permanent residence. it has been divided into districts and allotted among them. many have already removed and others are preparing to go. . " removal of southern indians to indian territory, 1835 this passage is most closely related to a) imperialism. b) the civil war. c) westward expansion. d) the french indian war.

How have changes in transportation affected washington, d. c.