Original sentence: Its founding document, the United States Constitution counted each black as being three-fifths of a white, and entrenched slavery, which was not abolished for over seventy years, and then only after a Civil War
Edited sentence: The country's founding document, the United States Constitution valued each black person as being three-fifths of a white (though this was intended only for taxation purposes, not as a profound comment on the nature of personhood), and conveniently failed to mention the practice of slavery, which was a vital part of the economy of its southern States, and concordantly not abolished for over seventy years - even then, only after a lengthy and bloody civil war