What I would answer is:
Rituals to celebrate important life events and predict and control misfortunes. Rituals brought human beings and spirits into contact through ceremonial drumming, singing, and dancing moved priests and worshippers to trancelike states in which they acted and spoke as the spirits themselves. Believed in spirits/souls existed before birth. God created universe, is transcendent, cares about the affairs of humans, and is a god of justice.
I believe you are describing density currents
Bantu languages were the languages used in the whole sub Saharan Africa.
Explanation:
Bantu people of the sub Sahara territory were migrants and they migrated across the whole continent below Sahara.
They took their language with them and often became the ruling lass of the places they would reach and thus it was something that bound these empires together.
The empires that were formed used the Bantu tongue for a long time and they were also ethnically related thus.
The Bantu people were thus the ones that would migrate and rule the Sub Saharan region.
The thirteenth amendment abolished slavery in 1865. But, this didn't guarantee slaves citizenship rights until the 14th amendment was passed.
