The person you're replying to did not at any point say that. What he said was that deflecting criticism of slavery in North America by mentioning slavery in Af

The person you're replying to did not at any point say that. What he said was that deflecting criticism of slavery in North America by mentioning slavery in Africa is an attempt to mislead by distraction, i.e., whataboutism. Yes, there were horrible things done elsewhere; but that does lessen the horrible things done in the USA in any way.