The election of 1800 demonstrated that

The Election of 1800. A captured moment in the amazing case of The United States v. Aaron Burr. The election of 1800 between John Adams and Thomas Jefferson was an emotional and hard-fought campaign. Each side believed that victory by the other would ruin the nation.

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The election of 1800 was the first time that power was passed from one party to another.  It demonstrated that the government is not only ruled by one party and that the United States is a democracy and not just another monarchy.

answer; /// i do believe that the correct answer is (d) cooperative play; /// good luck

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.