MikePhilPerez saidThere are more black dolls here in Ireland now than when I was a kid.
Yes. We had three dolls. All of them black women with brown to blond hair with very outsized heads. Used to think they were very funny. One was kneeling, eyes closed, lips pouting in a 'kiss me' expression; another was lying on her side smiling; and the last one was sitting and just smiling. I never knew where they were from, but Mom always treated them with some sort of affection so I gathered they are quite valuable. I got the impression that they were quite old. Probably 1940's or something.
As for the OP, it's called Blackface
. It's historical. They were a very big part of American entertainment and was only started to get actively abolished in the 1950's. Most were quite racist but some were instrumental in introducing the American Black culture to whites, especially their music. Some of the most loved singers in the early 1900's for instance performed in blackface. Note that the videos you embedded were meant to be historically accurate, it was not done to be racist. If anything else, it reminds Americans how ridiculous some parts of their cultures were. It was even a traditional part of the Mummer's parade. If you censor every depiction of blackface, you will only make them forget, as you yourself have. You seem to have never seen it before.
It's not limited to blacks either. White Americans have also portrayed asians, east indians, mexicans, and native americans by painting their skin performing stereotypical stuff (yellowface, brownface, redface, etc). Although not to the same popularity as blackface achieved. I think it was in some way, a way to assuage the guilt of Americans about the slavery. Make them feel better about themselves by caricaturing what they fully know are fellow human beings so they can distance themselves to the fact that they are enslaving people.
In the Philippines, we have a similar thing going on during festivals or fiestas. Some street dance performers would paint their bodies black to make them look like the aboriginal tribes here, the Aitas especially in the Ati-Atihan Festival, who were Melanesoid (superficially looks very much African, though the hair can sometimes be of lighter colors like in the Australian Aborigines). But this wasn't racist in any way (there was no performing of the stereotypes), more like pride in our origins. In our province it's a different tribe, the Manobo, who were Malay, and thus performers during the Kaamulan Festival would also dress up like Manobo people, etc etc.
But yeah. Why are you surprised about it? It's very much a part of history. I thought all black people would've known about it.