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The first atomic bomb test was on July 16, 1945 inside what is now called White Sands Missile Range in NM. The test was called Trinity and detonated a device called Gadget on the top of a 100 foot tall steel tower. The yield was estimated at about 20 kilotons.

It was both the first test and the first successful test.

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9y ago
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Q: What month and year was America's first successful nuclear test?
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