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The development of the hydrogen bomb in 1954 escalated tensions during

User Chiggs
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Answer:

the cold war

Step-by-step explanation:

User Swapnil Jariwala
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The development of the hydrogen bomb in 1954 escalated tensions during the Cold war. The 15-megaton H-bomb produced a 99,000-degree fireball that formed a mushroom cloud 60 miles high and 100 miles wide, contaminating almost 7,000 square miles.
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