The party that supported the direct election of united states senators

As representatives of a direct election process, the new senators supported measures that argued for federal legislation, but in order to achieve reform, a constitutional amendment was required. In 1911, Senator Joseph Bristow from Kansas offered a resolution, proposing a constitutional amendment. 17th Amendment to the U.S. Constitution: Direct Election of U.S. Senators. Americans did not directly vote for senators for the first 125 years of the Federal Government. The Constitution, as it was adopted in 1788, stated that senators would be elected by state legislatures.  17th Amendment to the U.S. Constitution

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.