Final answer:
The development of nuclear power in the 1950s and 1960s led to increased defense spending.
Step-by-step explanation:
The development of nuclear power in the 1950s and 1960s led to increased defense spending, as countries saw nuclear technology as a way to enhance their military capabilities and deter potential adversaries. The arms race between the United States and the Soviet Union during this period fueled a significant increase in defense spending.
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