Poland, there is a diversity of opinion on this matter.
No there is not stop making things up.
I was born in the UK to Polish parents who had bugger all to do with black slavery and colonising countries.
Guess there are black people out there who resent these crimes against their people , the same way Poles resent what the communists did.
Its your problem , same as Germans with the Holocaust, so you should take a knee and pay reparations for your historic crimes as the Germans did.
Stop projecting your historic guilt on other nations who do not have such a torrid history when it comes to slavery and race relations.
In other words sort your own backyard out first, you carry the guilt and sin of your ancestors to this day, so sort yourself out, knock down more statues and pay reparations if it makes you feel better.
Stop trying to radicalize the Polish word murzyn into something racist in your quest to beat your chest and make yourself feel better for what your forefathers did.
Go to London and join in with the BLM movement, because the UK is the historic home of modern slavery and racism.