Where are you getting your information from about slavery?
Ok, I'm gonna state the bleeding obvious:
Slavery existed in Africa before the Europeans arrived, as it did in ancient Rome & Egypt as well as many other places in the world.
I'm talking specifically about the transatlantic slave trade which pertains to my DD's homework.
Africans did not sell their "countrymen", rather their enemies, there was conflict and warfare between neighbouring empires and the Europeans took advantage of this, they bought slaves that had been captured during those conflicts.
Europeans began kidnapping & shipping africans indiscriminately by the barrel of a gun.
The British Royal African company shipped more African slaves to the Americas than any other company in the history of the Atlantic slave trade and was owned entirely by the British Crown.
This company quickly established a sustained slave trade that was brutal and driven by its own greed having initially formed to exploit Africa's gold fields, it also extracted other commodities.
Under this company people were branded like animals and seen as chattle.
Those that survived the inhumane transit conditions to the Americas were regarded as nothing more than cargo.
(Watch 12yrs a slave for cinematic reference)
They were sold to work on plantations to produce britain's "World trade commodities" sugar, coffee, tobacco, rice fields etc which made their slavers rich, producing wealth for Britain.
Over the next 200 years the social idea of race is constructed to justify the continuation of enslaving black africans, prior to this the English law was effectively colourless.
A social construct whose remnants still exist today.
The beginning of the British Empire abolishing the slave trade in 1807 started with the slave revolutions and revolts (Haiti and throughout the Caribbean islands and North America) following that the viability of the slave trade came into question which then started the abolition movement in the UK with the Slavery Abolition Act 1833 finally putting an end to this heinous institution (with the exception of Brazil which continued into the late 1800s). It was not due to the benevolence of the British.
New technologies in the industrial revolution made slavery no longer "economically viable"
There was more concern for the "damage to the plantation economy, owners and security" than for those enslaved.
This is just a brief synopsis of the transatlantic slave trade.
For more info slavevoyages.org is a useful resource.
It's easy to be misinformed about this heinous crime in history as it's been effectively buried.
My concern is that it's not being taught with sensitivity so that black children do not develop an inferiority complex.
Realise this is a long post...