Short answers, pulled from the story.
Hiroshima was founded in 1589 by the warlord Mori Terumoto on the delta coastline of the Seto Inland Sea. The name Hiroshima means "wide island" in Japanese. Hiroshima Castle was built shortly after, and Terumoto moved in by 1593.
The atomic bomb dropped on Hiroshima on the 6th of August, 1945, directly killed at least 70,000 people. By the end of 1945, total deaths from blast, injury, and radiation reached between 90,000 and 140,000. Fewer than 10% of the casualties were military.
The bomb, designated Little Boy, was dropped by an American Boeing B-29 Superfortress called the Enola Gay. The aircraft was piloted by Paul Tibbets, born the 23rd of February, 1915. The bomb was released at 8:15 a.m. on the 6th of August, 1945.
The Hiroshima Peace Memorial includes the Genbaku Dome, the preserved ruin of the former Hiroshima Prefectural Industrial Promotion Hall, which was the closest surviving building to the bomb's detonation point. The site was listed as a UNESCO World Heritage Site in 1996. The Hiroshima Peace Memorial Museum, also within the park, opened in 1955.
John Hersey wrote Hiroshima, which was first published in The New Yorker on the 31st of August, 1946, filling the entire issue of the magazine. The account narrates the stories of six survivors immediately before and four months after the bombing. The Japanese translation was released in 1949.
As of 2023, Hiroshima has a population of 1,183,696. The city is the largest urban center in Japan's Chugoku region. The GDP of Greater Hiroshima was US$61.3 billion as of 2010.