The United Kingdom,as reqired by the Quenbec agreement and Canada joined.
Engineers in the US was taslced with the bomb development.It was manufactured and successful.It was confiremed the test by dropping the first atomic bomb.
Hiroshima and Nagasaki on Aug 6 and 9,1945
It was the statement for the unconditional surrender to Japan.The oltimatum stated that if Japan did not surrender,it would face "prompt" and utter destruction".
Decision to surrender
The United Nation prepared for a very costly invasion of the mainland in Japan.The undertaking was preceded by air raids which devastaed67 cities in Japan.
In HIroshima,20000 soldiers killed and 70000-126000 civilians killed.In Nagasaki,at least 150 soldiers killed and 39000-80000 civilians killed.It is the only example in the world where the nuclear weapons have been used in the battle.
Japan surrenderd to the llies on August 15,six days after the bombing in Nagasaki.The Japanese governmant signed the instrument of surrender on Septenber 2,which effectively ended World War 2.