Lincoln's main objective in the Civil War was to have a superior military to the Confederacy in order to preserve the Union. While he wanted a superior military, he did not want to lose the border states by announcing that he was against slavery, as this would hamper his goal towards building a military.
The answer is C. he was pro-slavery, as he eventually released the Emancipation Proclamation in 1863 that freed all slaves in the South.
It's B <span>religious differences
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The southern(who were previously Confederate) states all wrote new Constitutions and swore loyalty to the Union by 1877. Also, the 13th amendment(which states no slavery n<span>or involuntary servitude</span> is allowed unless punishment... in u.s.), 14th amendment(forbids states to restrict simple rights of citizens etc,), and 15th amendment(citizens in U.S. cannot be denied due to race, color, etc. to vote) were acknowledged and remained after the reconstruction. Former slaves also had a new life ahead of them: they could now be educated, choose who they wanted to marry, and choose jobs. Unfortunately, the reconstruction didn't heal African American/ white man wounds; and even though there were laws for equality, for many upcoming years, many black people still had many problems with white people who still believed they were somehow superior.