I am not aware of facts supporting the claim that african americans live under an authoritarian regime.
I am aware that a number of african americans have been unjustly killed by police. That is a different claim than african americans are systematically oppressed by the US government.
For instance, compare what is happening in the US to a real authoritarian regime such as the USSR. The government made millions of innocent civilians disappear into the gulags en masse. Try to imagine even the hint of due process, let alone rioting and protests, within that regime.
Or compare what is happening here vs what is happening in China. The CCP places millions of Uighurs into concentration camps for no reason. In the US, we have thousands rioting violently in the streets, and I suspect the majority of the rioters will see little to no consequences for their actions.
Everyone in this thread knows you live closer to Minneapolis than to Ürümqi. You started the thread by discounting the difficulties of black people in USA. You wanted someone to give you some "facts" to "support" the claim that racism is a problem. All of us made the same assumption based on that evidence. We don't need to imagine anything else.
I've made no particular efforts in that vein; you are an open book. In reply to this observation you'll whinge on about how mysterious and unique and totally-not-racist you really are, but will offer no discernible arguments in favor of that proposition. It's really an HN trope by this point: say something totally privileged and douchey, and then insist that you may only be criticized by perfect and omniscient beings when other people call you on it. You're not the first person to do it; you won't be the last.