@pseudonym @talia_christine There was a big push to change to metric during the Carter administration and it made some progress. I remember road speed limit signs having both.

Reagan quashed it. I recall when NASA crashed a Mars lander, I think it was, because somebody forgot to make a conversion.

Metric is so easy but Americans cling to the clunky system because how dare anyone inconvenience them with change, even if it would be an improvement.