Abraham Lincoln and Apartheid

Learn from history
In continuation of the reservation issue in India, I realized that India is not the first country to go through this phase. USA has gone through the phase when Abraham Lincoln fought against the apartheid

Considering Abraham Lincoln to be one of the greatest leader in the history, we need to learn what he did good that made US a great country and also learn what mistakes he made. Wonder if the indian politicians (or the first mandal commission) ever gave it a thought