During the Jim Crow Era some states passed a law that said you could only vote if your ancestors had voted. This made impossible for Blacks to register. What was this law called?

Jim Crow law

Explanation:

pp

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.

imagine me knowing the answer