Why do republicans deny the party switch?

I’ve had people tell me that I’m history it was the republicans that wanted to abolish slavery and yes it was the republicans back then but technically as of today that was the Democrats... and of course so much more. You can’t just take credit for a party that was never affiliated with yours. Like the republicans today cannot take credit for the republicans in the 1800s because they were technically the Democrats not the republicans. I find it stupid how some people just choose to ignore history. Like do they think it makes them look better or what.
Why do republicans deny the party switch?
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