Remember 9/11 but not slavery?

People are always debating over this online. What do you think?
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People online says all the time, slavery was so long ago and people should just get over it; it isn't impacting anyone lives anymore (basically) . In response, those people says the exact same thing about 9/11 and its impact.

I hope this is clear enough what I am getting at here.

Note: I watch youtube all the time and this is a major debate.

Overall, I am just curious because youtube is much more aggressive in their approach to these two historical events and how people respond and compare
Remember 9/11 but not slavery?
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