President Andrew Jackson didn't want to have a war with Mexico but also did not want to deal with adding what could be another slave State. Jackson believes that if Texas was annexed, the other countries would view the United States a traitors. He was passionate about Texas but he was more passionate about keeping the Union together.
Your answer will be "fear in response to the threat of nuclear warfare that was prevalent throughout the Cold War". 1950 was a year that was within the cold war, and the fear of an out all war with the Soviet Union was lurking, and so the "atomic age" was coined.
it is also coined for the usage of the 'making of the nuclear energy' however it is usually referred to the cold war.
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Maybe it's anarchy I'm not sure I hope it's correct