Yes, both.
1949 thru 1950 prompted by USSR atomic bomb test.
The hydrogen bomb.
yes we did
atomic bomb or the hydrogen bomb
Manhattan Project
no one
To develop the atomic bomb for the USA.
Russia .
Project Manhattan.
They has fled the fascist government in Germany
Develop an atomic bomb.
We had the machinery and minds able to do what some primitive countries probably did not have at the time to develop the atomic bomb. Also we had resources capable of making such a weapon that other countries didn't.