What was the purpose of this type of office of war information poster?

a. to provide jobs to unemployed artists during an economic crisis
b. to the public understand its role in national security
c. to encourage young men to join the war effort
d. to protect civil liberties during times of national emergency

need , due !

B. To help the public understand its role in national security

In the context of this poster, "loose talk" means to conversation/gossip and "cost lives" refers to the war currently going on. The exclamation, "Quiet!" warns the public to not gossip about matters that could make the war worse or put the country at risk. Examples of these matters might include war plans or even negative information about the United States government.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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d.

many people believed they were convicted solely because they were anarchists.