Source: Wikipedia, the free encyclopedia.
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1969–1979
Amateur Athletic Union | |
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1980–1992
The Athletics Congress | |
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1993–present
USA Track & Field | |
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| Notes |
- OT: Since 1992, championships incorporated the Olympic Trials in Olympic years, otherwise held as a discrete event.
- 2020 OT: The 2020 Olympic Trials were delayed and held in 2021 due to the COVID-19 pandemic.
- Distance:The event was competed at 200 meters during 1969–1972
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Source: https://web.archive.org/web/20191106170415/https://www.usatf.org/statistics/USA-Champions/USAOutdoorTF/women/400mH.aspx
