Which city state compared with empires

a city state does not have an emperor  

the difference between a city-state and an empire is that a city-state dose not have a emperor

tearing down the berlin wall.

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.