Why did life in the South change after the Emancipation Proclamation and Civil War?

The entire way of life in the South would have to change. Southerners could no longer sell people as if they were property. They could no longer run large plantations with slaves as workers. They could no longer force black men and women to work all day in their cotton fields.

what are you saying?

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.