everything actually important is already metric
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Which sports use metric in the US? Gridiron football uses yards, auto racing uses miles, baseball uses feet, etc. The only sports I can think of that use metric are track and swimming, and those aren't as popular outside of Olympics time.
Afaik every American high school has a track program, and yeah every event is measured in meters
Funnily enough most high school swimming pools are 25 yards rather than meters.