How did the Aztecs use slaves to benefit their economy? Slaves were used to fight against other tribes.
Slaves were sold for profit in neighboring city-states.
Slaves were used to keep records for the civilizations.
Slaves were sacrificed to the gods for prosperity in return.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.