slavery or the holocaust which one was the most documented event in history?

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According to some Bollinger Fella,who claims"THE TRUTH IS THAT THE HOLOCAUST IS THE MOST DOCUMENTED EVENT IN HUMAN HISTORY". I on the other hand totally disagree with his statement,as Slavery was imposed on people who were born a certain colour so could not change that, where as being Jewish is a religious Choice,and anyone can change their religion at anytime. But i do agree they were two great tragedies in history.