True/False Indicate whether the statement is true or false.
19. Early Chinese civilizations probably did not have social classes.
20. Military technology advanced in the Shang period.
21. Land ownership was an important part of Zhou politics.

19;false 20;true 21;true

Explanation:

yes.

explanation:

because it let the japanese know who had the upper hand in the war.

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.