This is not a badly made film.
But is really about issues handling race in the US today which largely derives from the appalling way a supposedly progressive new country treated non-white people in law from day one. The reality is most West European countries have moved on. The documentary correctly points out that originall slaves were white Eastern European Slavs. The UK for example had an empire and did some bad things while building & maintaining it but AFAiK unlike the USA no part of the U.K. has legislated for the legal partition of citizens based on colour. The US maintained apartheid in some states as recently as the 1950s (after defeating Adolf Hitler). No wonder they have such a huge race issue/obsession.