Good thing the US doesn't use the Imperial measurement system then, (we use US Customary which is different than Imperial). That pretty much started to diverge by the end of the revolutionary War. And for your information, we are all looking for that same missing 10mm wrench and socket just like you guys are. We use the metric system all the bloody time. From soda pop and whisk(e)y to every food item in a grocery store to the Canyonaro pickups we drive are all metric. We just don't force it by law like the rest of the world.

The point was to make fun of any and all who think ANY measurement system is better than another or even matters at all. They all consist of made up units all thought up by random dudes long ago that enough other people thought were pretty skookum and decided to use.