The quote shown in the question can be attributed to which abolitionist - Frederick Douglass.
Frederick Douglass was an activist, abolitionist, orator, writer, and statesman who was an escaped slave from Maryland. He was a brilliant author and public speaker.
"What, to the American slave, is your 4th of July?
I answer - a day that reveals to him, more than all
other days in the year, the gross injustice and
cruelty to which he is the constant victim."
Thus, the quote shown in the question can be attributed to which abolitionist - Frederick Douglass.
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