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The Nullification Crisis was a time when the Confederate States of America (CSA) and the United States of America (U.S.) were at odds over the issue of slavery. The issue was first brought to the surface in 1831, when the U.S. Senate passed a resolution calling for the end of slavery in the Confederate States. The Confederate States refused to comply, and the resolution was met with violence. In 1832, the U.S. House of Representatives passed a resolution calling for the end of slavery in the Confederate States. The Confederate States again refused to comply, and the resolution was met with violence. In the end, the two resolutions were passed, and the crisis resulted in the death of a number of people.