Which nation dropped an atomic bomb on the city of Hiroshima?

The United States. They became the first and only nation to use an atomic weapon during wartime.

The United States

Explanation:

Rather than make a landing in Japan to stop the war, to reduce American casualties they decided to drop the newly developed atomic bomb on the cities of Hiroshima and Nagasaki.

6 pounds is equivalent to 92 ounces.

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theodore roosevelt 26th u.s. president : i admire his energy and passion. he was a fundamentally good man, brilliantly intelligent, possessed of extraordinary will and ability, supremely self-confident, bold, egalitarian, idealistic…. , lord, can we have him back?