You just lied right there, when you falsely claimed that my claims about Lincoln's morality based motives were just my opinion, when I have posted multiple quotes from him voicing his moral opposition to slavery.
If he first priority was to save the Union, he would not have run on such a strongly anti-slavery platform that drove the South to Civil War.
Just because I will not agree with your personal version of history that does not make me a liar.
Let's see if you can produce ANY QUOTE that he made DURING his campaign where he EVER stated that ending slavery took precedence over saving the Union.
"With a single mission in mind, Abraham Lincoln fought, during his entire presidency, not just against the South, but also against his critics—a cross-section of Americans that included everyone from journalists to generals. For Lincoln, the task was always to preserve the Union. In his first inaugural address, Lincoln said, “Continue to execute all the express provisions of our National Constitution, and the Union will endure forever, it being impossible to destroy it except by some action not provided for in the instrument itself.”
By the time Lincoln was sworn in as the sixteenth president on March 4, 1861, seven states—South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas—had seceded from the Union. Also by the date of Lincoln’s inauguration, this new confederacy of former states had already elected its own president, Jefferson Davis of Mississippi, the former United States senator from Mississippi and secretary of war under President Franklin Pierce. Well in advance of his first day in office, Lincoln knew he would preside over a fractious form of the once-united land. He committed himself to the preservation of the Union, but his first task was to bring it back together by whatever means necessary."
Source:
Abraham Lincoln Elected President, Part III: Overcoming Adversaries and Preserving the Union | National Portrait Gallery