In the 1960s, what federal action attempted to end the use of Jim Crow laws in the United States?

In the years following Reconstruction, the South reestablished many of the provisions of the black codes in the form of the so-called "Jim Crow laws." These remained firmly in place for almost a century, but were finally abolished with the passage of the Civil Rights Act of 1964

Explanation:

yes                                            

explanation:

just cause                            

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.