Answer:
"Lincoln's dilemma
With no hope of bringing the South back into the United States by protecting slavery, Lincoln had a new dilemma. His own political party, the Republicans, had formed around their opposition to slavery. Many of the more radical politicians in the party saw the secession of the South as the best opportunity to abolish slavery once and for all. As the US war dead piled up, more and more Northerners began to push Lincoln to punish the states that had seceded by making abolition a major goal of the war.
The problem with abolishing slavery, however, was that there were still four slave states that had not seceded from the United States: Missouri, Kentucky, Maryland, and Delaware. Lincoln feared that if he advocated emancipation he would provoke those states into joining the Confederacy, making the war even more difficult to win. Of the border states, Maryland was particularly worrisome, because the US capital at Washington D.C. sat on its border with Virginia. If Maryland decided to join the Confederacy, Washington D.C. would be completely surrounded by enemy territory."
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