Apparently meme's
It happens through cultural transmission. Here it is useful to use a term called meme coined by biologist Richard Dawkins. This is not the silly internet memes you see all over the place. Rather a meme is an analogy to genes:
A meme acts as a unit for carrying cultural ideas, symbols, or practices, that can be transmitted from one mind to another through writing, speech, gestures, rituals, or other imitable phenomena with a mimicked theme. Supporters of the concept regard memes as cultural analogues to genes in that they self-replicate, mutate, and respond to selective pressures.
https://erik-engheim.medium.com/but-slavery-ended-160-years-ago-22ca3a51efe6