President Abraham Lincoln signed the West Virginia statehood bill on December 31, 1862.
Per WV Archives and History:
When President Abraham Lincoln received the statehood bill on December 22, 1862, he was deeply distressed. He asked the six members of his cabinet for written opinions on the constitutionality and expediency of admitting West Virginia to the Union, but they divided evenly. Lincoln had supported the creation of the Reorganized Government of Virginia, but recognized the statehood bill as being forced upon him by Radical Republicans in their effort to use the war to end slavery. Lincoln recognized the questionable nature of the state’s creation, noting that “a measure made expedient by a war, is no precedent for times of peace.” Despite reservations, on December 31, 1862, Lincoln signed the bill because he could not afford to lose the support of loyal West Virginians. In his opinion, he wrote:
“Doubtless those in remaining Virginia would return to the Union, so to speak, less reluctantly without the division of the old state than with it; but I think we could not save as much in this quarter by rejecting the new state, as we should lose by it in West Virginia. We can scarcely dispense with the aid of West Virginia in this struggle; much less can we afford to have her against us, in Congress and in the field. Her brave and good men regard her admission into the Union as a matter of life and death. They have been true to the Union under very severe trials. We have so acted as to justify their hopes; and we can not fully retain their confidence, and co-operation, if we seem to break faith with them.”
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Opinion on the Admission of West Virginia into the Union
[December 31, 1862]
The consent of the Legislature of Virginia is constitutionally necessary to the bill for the admission of West-Virginia becoming a law. A body claiming to be such Legislature has given it’s consent. We can not well deny that it is such, unless we do so upon the outside knowledge that the body was chosen at elections, in which a majority of the qualified voters of Virginia did not participate.
Page 27But it is a universal practice in the popular elections in all these states, to give no legal consideration whatever to those who do not choose to vote, as against the effect of the votes of those, who do choose to vote. Hence it is not the qualified voters, but the qualified voters, who choose to vote, that constitute the political power of the state. Much less than to non-voters, should any consideration be given to those who did not vote, in this case: because it is also matter of outside knowledge, that they were not merely neglectful of their rights under, and duty to, this government, but were also engaged in open rebellion against it. Doubtless among these non-voters were some Union men whose voices were smothered by the more numerous secessionists; but we know too little of their number to assign them any appreciable value. Can this government stand, if it indulges constitutional constructions by which men in open rebellion against it, are to be accounted, man for man, the equals of those who maintain their loyalty to it? Are they to be accounted even better citizens, and more worthy of consideration, than those who merely neglect to vote? If so, their treason against the constitution, enhances their constitutional value! Without braving these absurd conclusions, we can not deny that the body which consents to the admission of West-Virginia, is the Legislature of Virginia. I do not think the plural form of the words “Legislatures” and “States” in the phrase of the constitution “without the consent of the Legislatures of the States concerned &c” has any reference to the new State concerned. That plural form sprang from the contemplation of two or more old States contributing to form a new one. The idea that the new state was in danger of being admitted without its own consent, was not provided against, because it was not thought of, as I conceive. It is said, the devil takes care of his own. Much more should a good spirit—the spirit of the Constitution and the Union—take care of it’s own. I think it can not do less, and live.
But is the admission into the Union, of West-Virginia, expedient. This, in my general view, is more a question for Congress, than for the Executive. Still I do not evade it. More than on anything else, it depends on whether the admission or rejection of the new state would under all the circumstances tend the more strongly to the restoration of the national authority throughout the Union. That which helps most in this direction is the most expedient at thisPage 28 time. Doutless those in remaining Virginia would return to the Union, so to speak, less reluctantly without the division of the old state than with it; but I think we could not save as much in this quarter by rejecting the new state, as we should lose by it in West-Virginia. We can scarcely dispense with the aid of West-Virginia in this struggle; much less can we afford to have her against us, in congress and in the field. Her brave and good men regard her admission into the Union as a matter of life and death. They have been true to the Union under very severe trials. We have so acted as to justify their hopes; and we can not fully retain their confidence, and co-operation, if we seem to break faith with them. In fact, they could not do so much for us, if they would.
Again, the admission of the new state, turns that much slave soil to free; and thus, is a certain, and irrevocable encroachment upon the cause of the rebellion.
The division of a State is dreaded as a precedent. But a measure made expedient by a war, is no precedent for times of peace. It is said that the admission of West-Virginia, is secession, and tolerated only because it is our secession. Well, if we call it by that name, there is still difference enough between secession against the constitution, and secession in favor of the constitution.
I believe the admission of West-Virginia into the Union is expedient.
By the President of the United States of America
A Proclamation
Whereas by the act of Congress approved the 31st day of December last the State of West Virginia was declared to be one of the United States of America, and was admitted into the Union on an equal footing with the original States in all respects whatever, upon the condition that certain changes should be duly made in the proposed constitution for that State; and
Whereas proof of a compliance with that condition, as required by the second section of the act aforesaid has been submitted to me:
Now, therefore, be it known that I, Abraham Lincoln, President of the United States, do hereby, in pursuance of the act of Congress aforesaid, declare and proclaim that the said act shall take effect and be in force from and after sixty days from the date hereof.
In witness whereof I have hereunto set my hand and caused the seal of the United States to be affixed.
Done at the city of Washington, this 20th day of April, A. D. 1863, and of the Independence of the United States the eighty-seventh.
ABRAHAM LINCOLN.
By the President:
WILLIAM H. SEWARD,
Secretary of State.



Links For More Reading On West Virginia Becoming a Statehood:
https://www.loc.gov/item/mal4349700/
https://quod.lib.umich.edu/l/lincoln/lincoln6/1:51?rgn=div1;view=fulltext