Which of the following was an effect of the Indian Removal Act 1. Many Indians in the south were forced off their lands
2. Settlers and Indians lived together peacefully
3. The cherokee formed a constitutional government
4. Chief Justice John Marshall was elected to the Supreme Court

1. Many Indians in the south were forced off their lands.

Explanation:

President Andrew Jackson signed the law in 1830. The law required Indians to leave the southern parts of the country in favor of whites. Many historians have declared this act to be a systematic genocide perpetrated by the former US president. In this way, Native Americans are strongly discriminated against. Jackson was steadfast in his intent even if he knew certain inhumane acts carried out by his officers in enforcing the law.

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.