On the Fact that on July 22nd, 1861, the U.S. Congress Stated THIS;

"......this war is not waged upon our part in any spirit of oppression, nor for any purpose of conquest or subjugation, NOR PURPOSE OF OVERTHROWING OR INTERFERING WITH THE RIGHTS OR ESTABLISHED INSTITUTIONS (THAT IS, SLAVERY) OF THOSE STATES; but to defend and maintain the supremacy of the Constitution and to preserve the Union......."......Oh yeah, Lincoln's war was allllllllllllll about slavery.