In the early 1960s there were statements like "ah, to be young, black and gifted!"

There were slogans like "black is beautiful!"

There were also groups like the Black Muslims and the Black Panthers. We were told that 'Negro' now considered a slur.

Eventually 'black' was elevated to 'Black', the proper name for a group of people.

So, for the last 40 years or more, Black is the correct term.

It was chosen and accepted by the group in question, something that most groups never had a chance to do.