[perilunar]

Americans do that all the time though. E.g. Celsius vs Fahrenheit, Metric vs US Customary units, getting rid of copper coins, 230 vs 110 V electricity, etc.

The fact that large parts of the world do something without any problems is no guarantee that people in the U.S. won't argue about it endlessly.

[tracker1]

Note the US is about as big as all of Europe, so it's easy enough for the US to do something different from other countries in a similar fashion to the EU doing something different themselves. Sometimes this complements things and the effects can be seen everywhere (USB charging/connectivity) and sometimes not.