How did nationalism and imperialism go together as a powerful idea in the early 20th century?

yes

explanation:

the fighting words doctrine, in united states constitutional law, is a limitation to freedom of speech as protected by the first amendment to the united states constitution. in 1942, the u.s. supreme court established the doctrine by a 9–0 decision in chaplinsky v. new hampshire.

c, because the american revolution was from 1765 to 1783.