Explanation: In the US Civil War, the (initially tepidly, later ardently) antislavery North fought to suppress an uprising by the pro-slavery South, which pronounced itself founded on the eternal 'truth' of white supremacy and caste-based slavery. They were crushed, and the supremacy of the North in that conflict led directly to the abolition of chattel slavery and voting rights being extended to Black Americans as the former slaver states were put under military occupation to suppress racist paramilitaries.
Whatever one's opinions on the rest of America's history - and much of it is ugly - shooting slavers is something we can all get behind!