Hiroshima is the capital of Hiroshima Prefecture and the largest city in the Chūgoku region of western Honshu, the largest island of Japan. The city's name means "Broad Island" in Japanese. Hiroshima gained city status on April 1, 1889. On April 1, 1980, Hiroshima became a designated city. As of August 2016, the city had an estimated population of 1,196,274.

Hiroshima was established on the river delta coastline of the Seto Inland Sea in 1589 by the powerful warlord Mōri Terumoto. He made it his capital after leaving Kōriyama Castle in the Aki Province. Hiroshima Castle was quickly built, and in 1593 Terumoto moved in. Terumoto was on the losing side at the Battle of Sekigahara. The winner of the battle, Tokugawa Ieyasu, deprived Mōri Terumoto of most of his land, including Hiroshima and gave Aki Province to Masanori Fukushima, a daimyo (a powerful Japanese feudal lord) who had supported Tokugawa.

Hiroshima is perhaps best known as the first city in history to be targeted by a nuclear weapon when the United States Army Air Forces (USAAF) dropped an atomic bomb on the city at 8:15 a.m. on August 6, 1945, near the end of World War II.

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