Why was the slave trade important to kingdoms in west africa before 1492

Which of the following created as part of president johnsons great was most directly aimed at breaking the cycle of poverty in the usa department of transportationb medicarec office of the consumer protectiond head start

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

What are the 4 main reasons to provide information