Why did europeans generally buy slaves from slave traders rather than capturing the slaves themselves?

a slaves were so cheap that capturing them was not worth the effort to europeans.
b laws prohibited europeans from capturing slaves but allowed them to buy slaves.
c europeans were morally opposed to capturing slaves but not to buying them.
d africans were generally able to hide from or defend themselves against europeans.

it took two men to wrestle rome back from chaos and turn a republic into an empire. in the first century bc, rome was a republic. power lay in the hands of the senate, elected by roman citizens. but the senators were fighting for power between themselves.

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