That liberty shall not perish from the earth - Buy liberty bonds Fourth Liberty Loan" poster
The pattern
This still is filed under War-bond ask.
Define
Money is requested as duty. The instrument is financial. The motive is belonging to the effort.
Mechanism
Civic purchase. The buyer is not shopping. They are enlisting with a wallet. Price is framed as participation.
Verdict
A public or communal instrument needs wide subscription and the stake is genuinely shared.
Why it works
Uses extreme negative visualization to motivate the public through fear and the desecration of a beloved national symbol. By bringing the devastation of the European war to American shores, it violently shatters complacency.
Steal this when
You need to shock an apathetic audience into action by vividly illustrating the absolute worst-case scenario of inaction.