His government decided to drop the world's first atomic bomb on Hiroshima.
On August 6, the atomic bomb "Little Boy" was dropped on Hiroshima, instantly leveling five square miles and killing an estimated 80,000 people.
The explosion wiped out five square miles of the city, including 62,000 buildings.
Director Christopher Nolan's film "Oppenheimer," which was released in July, is about the work that went on to build an atomic bomb in the years leading up to Hiroshima.
Here's how the bomb drop played out and why it wasn't enough to end the war by itself.
Persons:
Harry Truman, Christopher Nolan's, Oppenheimer
Organizations:
Service
Locations:
Germany, Japan, Hiroshima, Wall, Silicon, Here's