With the ending of the Civil War and the passage of the 13th Amendment how many African Americans were freed in the South?

The 13th Amendment to the U.S. Constitution, ratified in 1865 in the aftermath of the Civil War, abolished slavery in the United States. 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.”

Explanation:

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.

answer; analytical,creative and practical;