The African kingdom participated in the slave trade because they were not enlighten enough to know that their people will be sold to the land where they will not be able to see them again.
They were enticed with good such as umbrella, gin etc and they will raid the neighbouring community to capture slave to be sold to the slave merchant.
Therefore they participated in the slave trade due to their level of ignorance.
Explanation: The King-assassination riots, also known as the Holy Week Uprising, was a wave of civil disturbance which swept the United States following the assassination of Martin Luther King Jr. on April 4, 1968.
I believe D is the correct answer. If Japan (or any country) were to be hit with the largest natural disaster in recent history, it would most likely sway people away from migrating into the country.
