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Crisis Response

Preparedness Day bombing in San Francisco

A bomb exploded during a Preparedness Day parade in San Francisco on July 22, 1916, killing at least 10 people and injuring dozens amid a pro-military preparedness rally.

Preparedness Day bombing in San Francisco

The attack intensified national debates over preparedness and civil liberties, provoked controversial prosecutions (notably of Tom Mooney and Warren Billings), and exposed domestic tensions during the run-up to U.S. involvement in World War I.

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