The US government's decision to develop a hydrogen bomb, first tested in 1952, committed the United States to an ever-escalating arms race with the Soviet Union. The arms race led many Americans to fear that nuclear war could happen at any time, and the US government urged citizens to prepare to survive an atomic bomb.
Probably the kingdom of axum
Answer:
Ziggurats were built on high platforms to keep them safe from floods,
And Much of life in a Sumerian city centered on the ziggurat.
