Question

allies and spies
eventually, the united states formed the north atlantic treaty organization (nato), an alliance of
countries who would protect each other. nato was led by the united states
shortly after, the soviet union created the warsaw pact, their own alliance of countries
the united states created the central intelligence agency (cia), an agency formed with the purpose of
spying on the soviets.
in response, the soviet union created their own spy agency, the kgb
in 1952, the united states detonated the _.
atom bomb
nitrogen bomb
hydrogen bomb

Explanation:

In 1952, the United States detonated the hydrogen bomb. The atom bomb was used in 1945. There is no such thing as a nitrogen bomb in common historical military - weapon references. The hydrogen bomb represents a more advanced and powerful nuclear weapon compared to the earlier atom bomb.

Answer:

C. hydrogen bomb