By July 1945, the Allies' Manhattan Project had produced two types of atomic bombs: "Little Boy", an enriched uranium gun-type fission weapon, and "Fat Man", a plutonium implosion-type nuclear weapon.

Jan 17, 2026 · atomic bombings of Hiroshima and Nagasaki, during World War II, American bombing raids on the Japanese cities of Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945) that …

On the morning of August 6, 1945, the American B-29 bomber Enola Gay dropped an atomic bomb on the Japanese city of Hiroshima.

Sep 6, 2017 · Scientists first developed nuclear weapons technology during World War II. Atomic bombs have been used only twice in war—both times by the United States against Japan at the end of...

“The atomic bombings of Hiroshima and Nagasaki ended World War II. There can be no doubt of that. While they brought death and destruction on a horrifying scale, they averted even greater losses – …

In the spring of 1941, several British scientists implored Roosevelt to initiate development of an atomic weapons program in the United States, hoping to beat Nazi Germany in the race to develop this new …

Aug 5, 2025 · The Atomic Bomb and the End of World War II: A Collection of Primary Sources Seventy years ago this month, the United States dropped atomic bombs on Hiroshima and Nagasaki, the …

Aug 6, 2025 · The bombings of Hiroshima and Nagasaki were attacks on two Japanese cities by U.S. forces in August 1945, near the end of World War II. They marked the first — and, to date, only — …

Jun 7, 2021 · The United States bombings of the Japanese cities of Hiroshima and Nagasaki on August 6 and August 9, 1945, were the first instances of atomic bombs used against humans, killing tens of …

Jun 5, 2014 · The first two atomic bombs ever used were dropped on Japan in early August, 1945. For a detailed timeline of the bombings, please see Hiroshima and Nagasaki Bombing Timeline.