The US Constitution clearly states that only Congress may declare war against a foreign enemy, and Article III, Section 3 of the same document clearly defines the definition of treason committed against the United States.
‘Such Was the Spirit of Those Who Made the War’
“And so, without any authorization from Congress, Lincoln began a war on the Southern States which had formed themselves into a more perfect union. A few months after he began the war, he had the United States Congress to meet and the first thing offered was a resolution confirming and legalizing his acts, as if they had been authorized.
This particular resolution was before the Senate fifteen times between July 6 and August 6 and never passed. Then, after twenty months of warfare, the Supreme Court of the United States (67 US Reports, pg. 668) said Congress had no power delegated to it to make war upon a State, and that the President held no authority to make war – only Congress could do so.
That ‘the Civil War between the Northern and Southern States arose because the citizens of the States owed a supreme allegiance to the United States which the Southern States sought to absolve themselves from, by State secession, and the right of a State to do what was now being decided by wager of battle.’
There was no reason or ground stated to justify the above claim that “the citizens of each State owed supreme allegiance to the United States.” It was a war by the Northern States to hold the Southern States in union with them; a conquest of free, sovereign and independent States to be held under the domination of the more numerous States.
As Senator Baker, of Oregon, declared in the Senate that he favored ‘reducing the population of the Southern States to abject to the sway of the federal government.’ ‘We may reduce the Southern States to the condition of territories and send to them from Massachusetts or from Illinois, loyal governors to control them. I would do that.’ (Cong. Globe LW, pg. 48). Such was the spirit of those who made the war.”
(A Southern View of the Invasion of the Southern States and War of 1861-1865. Capt. S. A. Ashe, Raleigh, North Carolina. Pg. 53)