
Nevin Harrison, who has better canoe form than you or me, won the 2019 World Championship in 200 meter sprint at age 17. Her win was so unexpected they couldn't at first even find an American flag for the medal platform:
She then went on to crush the competition to win gold at the 2021 Tokyo Olympics at age 19, with the former two-time world champion Canadian (Laurence Vincent Lapointe) coming in second:

American Nevin Harrison wins gold in 200m canoe sprint
World champion Nevin Harrison can now add single 200m sprint Olympic champion to her title collection. The canoer crossed the line with a time of 45.932.

I believe the precocious Harrison is the first American woman to win a flat water sprint gold medal at the world championship or Olympic level.