What Happened
Pearl Harbor transformed the United States almost overnight. Mobilization touched factories, farms, shipyards, households, military bases, and communities across the country as America became what Franklin Roosevelt called the arsenal of democracy.
Why It Matters
World War II revealed American industrial power, sacrifice, and global responsibility on an enormous scale.
Worth Knowing
The United States declared war on Japan on December 8, 1941.
Where It Fits in the America 250 Book
This story appears in Chapter 6, Pages 89-92, as part of the 160-page landscape collector edition. The book expands timeline moments like this with archival imagery, maps, concise narrative context, and feature spreads designed for browsing and display.
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Pearl Harbor timelineWorld War II Americaarsenal of democracy