sure?
they were atomic bombs.
Hiroshima, Japan
The drop of the atomic bombs on Hiroshima and Nagasaki
the US decide to drop two atomic bombs on Japan, not china
Japan never dropped the atomic bomb on anyone. They did not have that technology.
In Hiroshima
No, the Japanese military did not drop any bombs on the USA after the atomic bombs were used on Japan. The bombs and pending invasion by the Soviets and the Americans (and allies) motivated the Emperor Hirohito to surrender to the Allied Forces.
If you are referring to WW2, then the US stopped using atomic bombs on Japan because Japan agreed to surrender. Had they not, the US had plans and production setup to drop a total of 23 atomic bombs on Japan in 1945.
Hiroshima and Nagasaki
They did not, it was the other way round.
Truman
No, America only dropped the atomic bombs on Japan.