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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.

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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