No Confederate monuments appear to mention slavery. Although some interpret references to the Constitution and States' Rights as implying slavery, this is a narrow interpretation of both as broader Constitutional interpretations and States' Rights issues contributed to the causes of the war. Only three of 422 Union monuments (0.007%) mention slavery.
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https://www.abbevilleinstitute.org/blog/the-real-reason-for-civil-war-monuments/?mc_cid=2951cc010f&mc_eid=29256acbee