There is, of course, no reasonable comparison between the colonies' relationship to an empire and the Perpetual Union which the states that attempted to secede had voluntarily joined. Again, the very definitions of reason and rational thought are challenged by such twisting of logic.
secession was perfectly legal..They voluntarily joined and they tried to voluntarily leave...but they got attacked.
When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, --That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
Declaration of Independence
1776
____________________________________________________________________________
Any people anywhere, being inclined and having the power, have the right to rise up, and shake off the existing government, and form a new one that suits them better. This is a most valuable - a most sacred right - a right, which we hope and believe, is to liberate the world.Nor is this right confined to cases in which the whole people of an existing government may choose to exercise it. Any portion of such people, that can may revolutionize and make their own of so many of the territory as they inhabit."
Abraham Lincoln
Jan 12, 1848