For those curious about the terms "white collar" and "blue collar," there are a couple interesting articles on the differences in America [1] and the difference in Africa [2].

Before one ascribes too much education or status to those labeled "white color," consider this quote from the first reference:

“It is a fact with which every union workingman is familiar, that his most bitter despisers are the petty underlings of the business world, the poor office-clerks, who are often the worst exploited of proletarians, but who, because they are allowed to wear a white collar and to work in the office with the boss, regard themselves as members of the capitalist class.” -- Upton Sinclair, 1914.

[1] "Blue Collar vs. White Collar Jobs: What’s the Difference?" https://www.mentalfloss.com/article/640951/blue-collar-vs-wh...

[2] "White-Collar Workers" https://www.cambridge.org/core/books/abs/general-labour-hist...