Explain why Abraham Lincoln promoted this response from South Carolina

Things have gotten worse over time, and now America has elected Abraham Lincoln, the nation's first anti-slavery president; he only represents the Northern states; and he will pursue policies that attack the institution of slavery. For twenty-five years this agitation (irritation) has been steadily increasing, until it has now secured to its aid the power of the common Government. A geographical line has been drawn across the Union, and all the States north of that line have united in the election of a man to the high office of President of the United States, whose opinions and purposes are hostile (against) to slavery. He is to be entrusted with the administration of the common Government, because he has declared that that
"Government cannot endure permanently half slave, half free," and that the public mind must rest in the belief that slavery is in the course of ultimate extinction.

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Abraham Lincoln's election as the nation's first anti-slavery president was a significant factor in promoting South Carolina's decision to secede from the Union. Lincoln's stance against slavery threatened the institution that was deeply intertwined with the South's economy and way of life. His belief that the government could not endure being half slave and half free, and his commitment to ultimately ending slavery, further fueled the South's fear and resistance. Lincoln's election was seen as a direct challenge to the South's way of life and values, leading to their decision to secede and ultimately start the Civil War.

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Abraham Lincoln's election as an anti-slavery president threatened the institution of slavery in the South. His belief that the government could not continue being part slave and part free led South Carolina to secede from the Union. Lincoln's stance on ending slavery fueled the South's fear and resistance, ultimately leading to the start of the Civil War.