1952
that we knew how to build one
because we could
1945
The hydrogen bomb.
It increased the nations fear of one another
Yes, both.
The island of Eugelab in Eniwetok atoll ceased to exist.
atomic bomb or the hydrogen bomb
During the Cold War (when US want the world to be capitalist while Russia wanted it to be communist) in 1950, US President Harry S. Truman authorized the invention of a bomb stronger than the atomic bomb (A-bomb), which both US and Russia already had in their arsenals, just in case if there would be a World War III when World War II just ended. The US tested its first H-bomb (hydrogen bomb) in 1952, which was thousands of times stronger than the A-bomb, then the Soviet Union (Russia) tested their own H-bomb in 1953.
1945
The first hydrogen bomb test by the US in 1952 was part of Operation Ivy and involved scientists from Los Alamos National Laboratory, the military personnel overseeing the test, and key government officials. Physicist Edward Teller played a significant role in the development of the hydrogen bomb.
The US program began in 1950 and tested its first device in 1952 and tested a deliverable bomb in 1954. The USSR program began in 1950 and tested a deliverable but limited bomb in 1953 and tested a full scale deliverable bomb in 1955.