Well, for one, Haiti really didn't have anything to offer the United States. No territory. Nothing to trade. Nothing really. But also, the idea of Africans rising up against an oppressive white government and overthrowing them made the United States very nervous, especially since we, at the time, had institutionalized slavery and a culture that was very much steeped in racism. Basically, we were afraid that if we supported the revolution in Haiti, it would encourage our own slaves to revolt against Southern slaveholders.
<span> The Civil War ended to most nullification attempts.
Nullification relied on principles of states' rights that were viewed as no longer viable after the Civil War.
</span><span> Southern states use in the 1800s to nullify tariff laws were states rights
hope this helps</span>
the answer is D encouraged slaveholder's resistance to abolitionist activists
