Lincoln was the worst, he killed about 1,000,000 whites.
1) There were millions white slaves ruled by blacks.
Spanish were enslaved by blacks for over 750 years.
Moorish ruled Spain, 711-1492, 781 years.
Islam in Spain, Wikipedia
There were millions Spanish slaves.
The ‘Golden age’ of Moorish ruled Spain - When Blacks conquered Spain, the first export was 3000 blonde Spanish virgins to the slave pens in Africa.
After Spain gained it freedom, Africans still took 1 million Spanish slaves for another 250 years (1530 to 1780). The greatest Spanish writer, Cervantes was a slave in Algiers, he was ransomed.
In the "Song of Roland", the Moors were described as "Blacker than ink with large noses and ears" and with "nothing white except the teeth."
2) There were 300,000 black slaves in United States.
Slavery in the United States, Wikipedia