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Increased during the Arms Race, they had to invest lots of money to remain competitive against Russia.

The correct option is:

Increased during the arms race against the USSR.

The nuclear arms race was a competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their corresponding allies during the Cold War. With both sides having nuclear capacity, an arms race evolved, with the Soviet Union venturing first to catch up and then to surpass the American arm capability.

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