The US is hanging tough with Liberia and Myanmar as the
Hopefully the graph is not too hard to read; click and make larger.
above graph and cartoon from USMA
road sign from Averill Hecht
I find this pretty interesting and want to learn more about the metrication push from 1975 to 1982 that I can't remember (and I know L &J can't either). It was largely resisted and ineffective and finally done away with by Reagan in March 1982 to "reduce government spending and its streamline operations." Stop you're killing me.
Later in grade school, I remember a perceptibly half-hearted effort to teach the metric system; it was pretty crude and as inexact as possible: a meter is like a yard, a kilometer is about 200 school buses holding hands, you are not a litre- and other equally useless equivalents. C'mon you gotta know this stuff.