Spain, Portugal, and Belgium as well.
Portugal were basically the Uber drivers of the Atlantic Slave Trade---they owned the majority of the ships used to transport slaves during that era and did it for all the European powers. They're now so broke that Angola had to bail them out a few years ago after a crisis hit them...you literally now have Portuguese immigrating to Angola although they call themselves "Expatriates" now.
Spain as well...got humiliated by USA/Teddy Roosevelt, got all their colonies took especially the Phillippines- I think its the fact that they won't be able to ever pay for reparations that allows people to overlook them.
Belgium is an artificial creation the British Empire made because they were paranoid of the Russian Empire and Prussia. Basically the same paranoia that the USA has today with regards to Russia.