The Soviet Union had exploded its own nuclear bomb (a fission bomb) in 1949, and Truman wanted the United States to stay ahead of the Soviet Union... as did lots of other people. So a fusion bomb (more powerful than a fission bomb, but used a fission reaction to set off a fusion reaction) was developed.
He believed that developing nuclear weapons instead of preparing for conventional war was more cost-efficient.
He hoped it would restore the United States' advantage over the Soviet Union.
He believed that developing nuclear weapons instead of preparing for conventional war was more cost-efficient.
Massive retaliation -apex
Massive retaliation -apex
It was called "massive retaliation."
Massive retalliation
Massive retalliation
It was called "massive retaliation."
It was called "massive retaliation."
It was called "massive retaliation."
It was called "massive retaliation."
Massive retaliation
Massive retaliation