Why is the word negro seen as offensive, even though it is a more formal word than “black” when describing someone of African heritage?

Anonymous
I always found the word “black” to not be a very formal way of describing an ethnicity. Negro is more formal, yet it was seen as offensive since the 60’s for some reason.
Why is the word negro seen as offensive, even though it is a more formal word than “black” when describing someone of African heritage?
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