Final answer:
Nat Turner was a leading figure against slavery, not an advocate for it. He organized a significant slave rebellion in 1831 in an effort to end slavery, directly contradicting the premise of the question.
Step-by-step explanation:
The question contains a significant error. Nat Turner did not become a leading advocate of slavery as a positive good. Instead, Nat Turner was a key figure in the fight against slavery and led one of the largest slave rebellions in United States history. Utilizing his religious beliefs and inspired by his own visions, he sought to end the oppressive system of slavery through violent rebellion. In 1831, Turner led a group of slaves and free blacks in Southampton County, Virginia, to rise up against their enslavers, resulting in the deaths of some sixty white individuals. The rebellion was eventually suppressed, but it had a profound impact on the South, leading to stricter control measures over slaves and free blacks and a more entrenched pro-slavery stance among white southerners. This question likely confuses Turner with pro-slavery advocates of the time, who defended slavery as a positive institution.