It was not quite a 100 years old yet but your close
The North didn’t believe in slavery and the south did. The constitution divided them because they both believed in different things. In the South there was more plantations so they needed slaves to keep up the production when the North was cold and didn’t need much help on plantations.
Answer:
2) Refusing to join the League of Nations
Explanation:
The best action that demonstrated the United States' effort to isolate itself from European conflicts after World War I is "Refusing to join the League of Nations."
This is evident in the fact that the United States Congress failed to pass the bill to join the League of Nations. This is based on the idea or some Isolationists' fear that it might make the United States drawn into International issues unnecessarily.
One of the actions that were done to promote assimilation among American Indians, both in the US and in Canada, but also for example in Denmark, is compulsory sending them to boarding schools.
In those schools, the children were forbidden to speak their indigenous language, and many came home (if they were allowed to come home) without being able to communicate with their parents.
It gives all accused criminals the right to a fair trial. This way the government cannot prosecute them for something they did not do.
