Ya gotta know your history to get this...

when you kill your first friend and enemy

This has nothing to do with the meme.

Also, it is worth noting that Republicans at that time were more liberal than the Conservative Democrat party who wanted to keep to the socio-economic position of slavery.

It would be more accurate for the sake of clarity and communication to say "Juneteenth, the day the liberals freed all the slaves of the conservatives."

At that time, the conservatives where Democrats, and the liberals were Republicans, but it has switched now.

Quite so. I was working to clarify your position on the subject as there are those who reject these facts. They exist. And it boggles the mind in a metaphorical sense.

And to be more clear, this isn't a matter of left wing vs right unless you consider federalism vs republicanism to be left vs right whereas left is federalist or "socialist"

I guess it's more of a history riddle...