What do you mean, "leader"? Harry Truman was president of the US when both the first and second atomic bombs were dropped. The commander of the aircraft the "second" bomb (actually the third detonated, but the second to be "dropped" since the first was a test explosion and was not dropped but rather mounted on a tower) was dropped from was Major Charles W. Sweeney.
the second bomb was dropped on Nagasaki
Nagasaki.
The second atomic bomb used in combat was dropped on Nagasaki.
nagasaki
The first atomic bomb was dropped on Hiroshima, on August 6, 1945. The second atomic bomb was dropped on Nagasaki, on August 9, 1945.
Bockscar
That was Nagasaki.
On August 9th 1945 the Fat Man atomic bomb was dropped on Nagasaki Japan.
They surrendered to the U.S. But only after the second bomb!
On the 6th August 1945 the first atomic bomb was dropped on the Japanese city of Hiroshima. Three days later, a second bomb was dropped on Nagasaki.
Nagasaki .
Bockscar