Final answer:
The United States built the hydrogen bomb to respond to the Soviet Union's atomic weapons during the Cold War, aiming to gain a strategic advantage in the arms race.
Explanation:
The United States built a hydrogen bomb as a response to the Soviet Union's development of atomic weapons during the Cold War. The hydrogen bomb, or thermonuclear weapon, was seen as a more powerful weapon than the atomic bomb, providing the U.S. with a strategic advantage. The arms race between the U.S. and the Soviet Union led to the creation and testing of increasingly advanced nuclear warheads.
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