Allyson Felix took home her seventh Olympic medal with a silver, while Shericka Jackson of Jamaica finished with a bronze.
Miller got out to a big lead over the first 300 meters, holding on down the stretch as the experienced Felix charged over the final 100. Miller's dive secured a personal-best time of 49.44 seconds, while Felix finished at 49.51.
With her silver, Felix became the most decorated female track athlete in U.S. history, surpassing Jackie Joyner-Kersee with her first medal in the 400
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