Who opposed the war, and how did President Lincoln respond to their opposition?

Copperheads opposed the laws.

He responded by suspension of habeas corpus and use of martial law agitated this political opposition

Explanation:

Copperheads: Also called, “Peace Democrats,” they were Northern Democrats who vocally opposed the Civil War and favored an immediate peace agreement with the Confederate states.

The Copperheads took advantage of the public agitation by attacking Lincoln's actions and character while deeming his expansion of power as unconstitutional and dangerous. Lincoln's suspension of habeas corpus and use of martial law agitated this political opposition.

They opposed Lincoln's decision to call out the militia, which is a congressional prerogative; challenged his order to blockade Southern ports, which they claimed was an act of war before Congress declared war; and disputed the income

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