Conversation so far:
how many lives were lost in the bombing of hiroshima and nagasaki
The Atomic bombings of Hiroshima and Nagasaki killed between 129,000 and 226,000 people.
when were the bombings of hiroshima and nagasaki
The United States detonated two nuclear weapons over the Japanese cities of Hiroshima and Nagasaki on August 6 and 9, 1945, respectively.
have nuclear weapons been used since the bombings of hiroshima and nagasaki
The two nuclear bombings in Japan remain the first and only uses of nuclear weapons in armed conflict.

Question: which country authorized the bombings
Self-contained rewrite: which country authorized the us bombings of hiroshima and nagasaki