What were Lincoln's most dangerous political foes, which were strongest in northern states where many former southerners resided, known as?

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Copperheads were a group of Northern Democrats who opposed the Civil War and were sympathetic to the South. They were particularly strong in areas where there were many former Southerners residing. They were considered one of Lincoln's most dangerous political foes as they actively worked to undermine his war efforts and criticized his policies.

What Were Lincoln's Most Dangerous Political Foes, Which Were Strongest