All cultures build upon the one before it. It goes a little bit like this, though it can be argued differently.
Egyptians (North Africa strongest military and many inventions, writing systems etc.) Neo-Assyrian Empire (Middle-East) Achaemenid Empire (Middle-East) Mauryan Empire (India) Han Dynasty (China) Roman Empire (Europe) Song Dynasty (China) Mongols (Almost all of Asia and Western Europe) Ottomans (Ottomans defeat the Mongols) Spain (Finally becomes independent from the Moors, North African Muslims) France (Napoleon invades Spain and installs his brother as ruler, Spanish Empire begins to crumble, loses colonies) British Empire (Finally defeats France. Loses status in WWI and WWII to USA) USA (The Whole World)
"We still have institutionalized racism in the form of police brutality and the prison industrial complex that specifically targets POC. "
You forgot Planned Parenthood. For some reason they seem to unfairly target POC. Some say it's because the founder Margaret Sanger was a racist who felt black people should be slowly phased into extinction via birth control and forced sterilization. Despite her views, I think it tends to do more with economics than a long past legacy, but that's just me. Either way, they are unfairly targeted.