I believe both the US and Canada passed laws in the 70s to convert to the metric system at the same time but when Reagan took over he stopped it, pretty sure there are a few towns that started the conversion and never changed back. When I was in elementary school we learned both systems, I only use C when checking my PC components temp
https://www.geographyrealm.com/the-only-metric-highway-in-the-united-states/
"The last such attempt was initiated by the signing of the Metric Conversion Act in 1975 by President Ford. The voluntarily nature of the Act contributed to an overall inertia in embracing the metric system and the Metric Board was disbanded in 1982 by President Reagan."