".. they used to 'grade' Indigenous Australians according to the percentage of 'black blood' they had as well - the terms 'quadroon' etc were also used here in Oz for most of the twentieth century, to categorise and often incarcerate people. Cheers,
Quokka "

I'm surprised to hear that. I can only assume that it was used in a specific region or in particular walks of life. The only place that I came across the term was in a series of novels set in the southern USA. During the last quarter of the twentieth century I lived in Melbourne, Broken Hill, Arnhem Land, Adelaide, and a couple of years in Papua New Guinea, without ever encountering it. With so many races in Australia I think it would be a very brave, or naive, person that would attempt to categorise percentages of blood lines.

I'm not sure where this discussion is heading though. Given that some offensive words should be removed from current use, no amount of politically correct name changing, e.g. American Indian/Native American/First Nation, will remove bigotry where it exists. Conversely, if you are my friend that doesn't change if you decide to call yourself Negro instead of Afro-American.

Humans love to put each other into categories; Blond/brunette, black/white, Hindu/Moslem, Scottish/Irish, north or south of the river - just because you may be placed into a particular category doesn't necessarily mean that there is any negative judgement attached.