I never realized that actually understanding the plight of African-Americans meant that I hated America or blamed the system that is America.
Truth is, there have been a number of legislative actions that have been severely detrimental to African-Americans over the past 200 years. To deny that is ignorance and jingoism...not patriotism.
As for your point about great civilizations...Greece, Babylon, Persia, and China all sold members of their own race into slavery. These slaves were often brutally beaten, initially. However, if you are going to try to convince me that the Africans who sold the slaves to the Americans and Europeans thought that they were selling generations into bondage, then you might as well save your breath. I am not buying what you are selling.
Also, breathing does not fit my definition of life. So, if you want to pat yourself on the back because we extended the biological life of the Africans, go for it. I place a lot more value on the soul and spirit, and the slave trade most certainly crushed that early and often.