"No state shall, without the consent of Congress, lay any duty of tonnage, keep troops, or ships of war in time of peace, enter into any agreement or compact with another state, or with a foreign power, or engage in war, unless actually invaded, or in such imminent danger as will not admit of delay."
I post this for the constitutional argument only (for the record - you can honor whomever you choose in whatever way you choose) I have no interest in getting into the argument these threads typically devolve into
Thank you, unfortunately many would disagree with you - thinking that we must bury the past forever. The section of the Constitution to which you refer would only apply to states still in the Union - the south formed her confederacy after legally seceding from the federal union. The was nothing in it that said she couldn't, no federal laws against it, the rights were granted in Amendments 9 & 10, and expressly reserved by New York, Rhode Island and Virginia in the ratifications, and accepted by every single member of the union.