Answer:Since I don't have the specific text you're referring to, I can't provide direct quotations. However, generally speaking, quotations that emphasize Katherine Johnson's contributions to NASA's early space missions, her role in calculating trajectories for historic flights like John Glenn's orbit around Earth, and her impact as an African-American woman breaking barriers in STEM fields would best support the idea of her importance to U.S. history. These could include statements about her accuracy in calculations, her pivotal role in the success of missions, or her influence on diversity and equality in science and engineering.
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