Why did Lincoln suspend habeas corpus? 0 to keep people from voicing their opinions
0 to protect against threats from antiwar
activists
to keep more states from seceding from the
Union

Correct answer is to protect against threats from antiwar  activists

Explanation:

Lincoln did this so he could prevent those who are supporting South from affecting other people in the country. He did this by putting those people in jail. It happened in 1863.

All other options are not true, as it wasn't suspended because of secession of new states or freedom of speech.

c. typhoon

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