The two highlighted examples that best identify the basis for McCarthy's fear of the spread of communism are:
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The numerical shift in populations under Soviet control, which increased from 180 million to 800 million, demonstrating the rapid expansion of communism globally.
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The change in the balance of populations from 9 to 1 in favor of the anti-totalitarian side to 8 to 5 against, illustrating the perceived threat to democracy and the implications of increasing communist influence.
These examples illustrate McCarthy's concern about the growing power of communism and the existential threat it posed both globally and within the United States.