I first heard of "The Black and White Minstrel Show" while touring the Museum of the Moving Image in London. They only displayed one still photo and a caption, but it astonished me. "Blackface" had died out many years earlier in the US. I don't think it was ever shown on American TV. (No doubt someone will soon correct me if I'm wrong.) But "The Black and White Minstrel Show" lasted until 1978 in Britain! I can't speak on the merits of the show, since I never saw it, but the photos seem bizarre.There are several web sites about the show. One can be seen here.
One British site contained this statement: "The Black and White Minstrel Show harked back to a specific period and location--the Deep South where coy white women could be seen being wooed by docile, smiling black slaves." That writer doesn't understand much about American culture. In the South, black men were sometimes lynched for allegedly looking at white women with lustful intent. Back when minstrel shows were popular in the US, I doubt that they ever depicted interracial "wooing." The idea just wouldn't have been considered a fit subject for popular entertainment. It would have been considered outrageously obscene. (And I am using "outrageous" in the old-fashioned sense, "grossly offensive to decency, morality, or good taste.") American TV, whose content was originally tightly controlled by advertisers who didn't want to risk offending even the most prudish viewers, retained its puritanical aspect until the 1970s.
There was one anomaly: the American sitcom "Amos 'n' Andy." It started out as a radio show in which white actors portrayed black characters. Later, it was a TV show, using all black actors. I became acquainted with it when it was being shown as reruns during the after-school-and-before-supper period that was devoted to kids' TV in the late 1950s. I have fond memories of it, and I wish it could be shown again. This is one instance where I think our PC tendencies, although usually laudable, have gone a bit too far.
There is a good description here.