Which amendment, conceived under president lincoln, but amended under president johnson, abolished slavery in the united states of america?
a. the twelfth amendment
b. the thirteenth amendment
c. the fourteenth amendment
d. the fifteenth amendment

B. The 13th Amendment of the U.S. Constitution
The 13th Amendment states, "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."

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