https://arslege.pl/zasada-rownosci-kobiet-i-mezczyzn/k15/a52...
In the hundreds of years prior to that most everyone else in the country was allowed to acquire land, wealth and an education while the enslaved folks were legally blocked from doing the same. It took nearly another ~100 years for their right to vote to be marginally protected and to finally end legal segregation, that was less than one generation ago so you can imagine that the inequity here won't match that of every other country.
My assumption is that they are not aware of the tragic, race-based history here (they said they live in Poland, I doubt the curriculum there has years and years of US history) so I gave them a brief overview of the history behind the current inequity that this group aims to help correct (including specifically talking about some related differences between their statement about the Polish constitution and how the US constitution started and changed over the centuries)