The first atom bomb was the test explosion at the White Sands test range in New Mexico. The first use in anger was at Hiroshima in Japan.
Hiroshima, Japan
Hiroshima, Japan, also Nagasaki, Japan
Test explosion 7/16/1945 in New Mexico Hiroshima, Japan 8/6/1945 Nagasaki, Japan 8/9/1945
Hiroshima, Japan
They surrendered.
The bomb was. of course, carried into the country of Japan by an airplane. If you are asking about the fallout from the explosion, yes, a small amount of fallout will be carried by winds to other countries.
Radiation taints the ground, everyone in the blast radius of the initial explosion would be decimated. Look at Hiroshima, Japan, or Nagasaki, Japan (not sure on spelling), they were bombed by an atomic bomb, and still have radiation poisoned in the ground.
The atomic bomb was dropped on Hiroshima and Nagasaki RB
See website: Atomic bombings of Hiroshima and Nagasaki.
Hiroshima and Nagasaki(atomic bomb,not a nuke)
1945