re: African - Americans

The US technically only had slaves for under 100 years.

Using your standard the numbers of years of slavery skyrockets in other countries that passed slavery on to the state that succeeded a failed state. The biggest reasons its not worse is due to overall turmoil in Africa.

Im not even understanding this 400 year math. Thats an end at 1892 if it started with Columnus. So a math lesson is obviously needed here.