Answer:
American principles traditionally opposed to imperialism.
Step-by-step explanation:
The American Anti-Imperialism League was formed so as to oppose to new expansion tendencies. It argued that the traditional American attitude was that the only lawful and just government was the one that is approved by those who are governed.
According to the members of the League, it was a violation of the original American beliefs but sadly for them, it didn't persist and the organization, as well as the beliefs were shut down and defeated in the beginning of the 20th century.