What countries were involved in the nagasaki war?

The term "Nagasaki war" is not commonly used; however, if you are referring to the events surrounding the atomic bombing of Nagasaki during World War II, the primary countries involved were the United States and Japan. The U.S. dropped an atomic bomb on Nagasaki on August 9, 1945, following the bombing of Hiroshima three days earlier, which contributed to Japan's eventual surrender and the end of the war.