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."

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.

Answercrime mapping;