Abraham Lincoln, arguably America's greatest President, issued the Emancipation Proclamation to free 3 millions slaves, who were not only excluded from the electorate - but whose legal status was not that of human beings but merely the "property" of their owners
When asked, "Why not let the South go in peace?"
Lincoln replied: "I can't let them go. Who would pay for the government?"
In order to coalesce the forces in the North, Lincoln had to stage an incident to inflame the populace, which he did. The firing on Sumter was, by his own admission, a setup for just such action. Lincoln was aware that provisioning Sumter could provoke a war.
Lincoln's letter to Gustavus Fox on 1 May, 1861, makes it clear that he was pleased by the result of the firing on Ft Sumter... "You and I both anticipated that the cause of the country would be advanced by making the attempt to provision Ft Sumter, even if it should fail; and it is no small consolation now to feel that our anticipation is justified by the result."
Abraham Lincoln said the following on September 18, 1858 in a speech in Charleston, Illinois:
"I will say, then, that I am not, nor ever have been, in favor of bringing about in any way the social and political equality of the white and black races [applause]: that I am not, nor ever have been, in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people; and I will say in addition to this that there is a physical difference between the white and black races which I believe will for ever forbid the two races living together on terms of social and political equality. And inasmuch as they cannot so live, while they do remain together there must be the position of superior and inferior, and I, as much as any other man, am in favor of having the superior position assigned to the white race." -- Reply by Abraham Lincoln to Stephen A. Douglas in the first joint debate, Ottowa, IL; 21 Aug 1858
"I have never seen to my knowledge a man, woman, or child who was in favor of producing a perfect equality, social or political, between Negroes and white men." Opening speech, fourth joint debate with Douglas, Charleston, IL; 18 Sep 1858
"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, 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 much territory as they inhabit." -- Abraham Lincoln
"I have no purpose, directly or indirectly, to interfere with the institution of slavery." - First Inaugural Address
"I am a little uneasy about the abolishment of slavery in this District (of Columbia)." - To Horace Greeley
"If I could save the Union without freeing any slaves, I would do it." - To Horace Greeley
"What then will become of my tariff?" - Abraham Lincoln to Virginia compromise delegation, March 1861.
On August 14, 1862, Lincoln received a deputation of free Negroes at the White House to which he said, "But for your race there could not be war... It is better for us both, therefore, to be separated". He advocated colonization in Central America and promised them help in carrying out the project.
"What I would most desire would be the separation of the white and black races." From a speech in Springfield, IL; 17 July 1858
"Such separation ... must be effected by colonization ... to transfer the African to his native clime, and we shall find a way to do it, however great the task may be." - From a speech delivered in Springfield, IL; 26 June, 1857
"The [Emancipation] proclamation has no constitutional or legal justification except as a war measure." - Letter to Sec. of Treas. Salmon P. Chase; 3 Sep 1863
"The suspension of the habeas corpus was for the purpose that men may be arrested and held in prison who cannot be proved guilty of any defined crime."
"Arrests," wrote President Lincoln to that Albany committee of Democrats, "are not made so much for what has been done as for what might be done. The man who stands by and says nothing when the peril of his Government is discussed cannot be misunderstood. If not hindered (by arrest, imprisonment, or death) he is sure to help the enemy."