There is a concept I discovered via youtube of a concept called the Mandela Effect.
It deals with memory. Not individual memories but large groups.
One example is:
Appollo 13 the movie.
Many folks including me heard Tom Hanks say “Houston we have a problem.” Yet the line is suppose to be “Houston we’ve had a problem”.
Individuals misremember all the time. But how about large swaths all have the same misremembering of a memory..
I would think it could easily be manipulated. For example Trump lied when he said he saw Muslims in NJ cheering on 9/11. Right after you saw online people saying they saw the same thing. They did not. Yet by suggestion and acceptance of a lie being true they were open to misremembering an event.
The Mandela Effect seems interesting from a psychological view. Do we remember things as is or can different causes change ones memories? Or is there alternate realities and the differences in them are minor? I would put the Jersey lie as just a manipulation of memories where gullible racists believe in a lie to satiisfy their world view.