Why did the spanish landowners want to keep slaves?

They had slaves to work their fields.

The slaves mad them rich, and they also had made them feel powerful.

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful