>Yet UK pushed through with switching to metric and went way further than US did. So this excuse isn't really valid.
And yet they didn't switch over completely. People in the UK measure some things in metric and some things in the old Imperial units, which is the worst of both worlds. Pick up some random thing and its weight is measured in kg, but if you're weighing a person it's "stones". From here to the wall may be about two meters, but from here to London is 100 miles. I'd rather have what we have in the US, thanks all the same.
>The real answer is, that in US politicians were too weak to push this through, because all kind of manufacturers and unions were pressuring them to stop the effort. In UK they just ignored the pressure. In US they budged.
Politicians aren't supposed to be "strong". They're supposed to do what the voters want them to do. If politicians are forcing you to do something you don't want to do, your government is out of control. In the US the people didn't want to convert to metric because it's easier to estimate in whatever system you grew up with. Manufacturers were all for the metric system since it makes managing global supply chains easier.