Explore how Japan's attack on December 7, 1941 transformed the United States from an isolationist nation to a global superpower, examining both the strategic miscalculations and the profound psychological impact that reshaped American identity.

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From Columbia University alumni built in San Francisco

**Lena:** Hey there, Miles! I was just thinking about how certain events in history completely change the course of nations. Pearl Harbor has to be one of those defining moments, right?
**Miles:** Absolutely, Lena. December 7, 1941 - as President Roosevelt called it, "a date which will live in infamy." You know, what's fascinating is how this single attack transformed America almost overnight from an isolationist nation into a global military power.
**Lena:** That's so true. It's hard to imagine now, but before Pearl Harbor, many Americans wanted nothing to do with the war in Europe or Asia. Then suddenly, everything changed in just a few hours on that Sunday morning.
**Miles:** Exactly. And the attack wasn't just militarily significant - it was a profound psychological shock to the American system. The idea that someone could strike American soil so boldly... it completely reshaped how Americans viewed their place in the world.
**Lena:** So let's dive into what actually happened that day and why the Japanese made what ultimately proved to be such a fateful decision to attack.