I mean - yes, the present is impacted by the past - but the African slave trade in Africa is also responsible for today's situation. That's the thing, it wasn't a trade that was only controlled by white Europeans. It was controlled by wealthy Africans and wealthy Europeans to send people to the Americas, or in the east, to the Middle East.
You can go to Africa today and the tribal conflicts and relations that were behind the slave trade, and the class differences, have incredible impacts on people there. The idea that this is unique to the US is quite a narrow perspective. There are still people in Africa who look down on their neighbours, because their ancestors enslaved their neighbours ancestors. You can see this among people in India, or Asia, even the people of New Zealand had their own pre-existing class hierarchies.
The other element here is that this kind of situation is not actually unique to black people. You can look at migrations within Europe, and class differences, and these too are related to things like past migrations and invasions. Poor white people today are in many cases poor because their ancestors were poor and oppressed, by people from some other group.
You can also find that in many cases, especially here there was already a fairly developed social and political culture, when the British came to a place, often looking for trade relations, the people there were keen to use the British not only to increase their own wealth through trade, but to gain allies against their enemies. They had agency, and goals of their own, and conflicts of their own. There wasn't some kind of blank slate.
No one wants to deny the history of the UK, but it's one part in a much larger history of peoples with their own goals and historical arcs. And not generally especially better or worse, although it did, uniquely, abolish slavery for ideological reasons, and attempt to stop the trade of slaves outside of their own country.