Our senate back in the very early 1900's, like 1912 or something, missed converting to metric by 1 vote. It would have been far easier then. I think metric is easier working on cars. MM wrenches are easier as the higher number means a larger wrench for a bolt. English has stuff like 9/16's, 3/8's and such divisions of an 1".
We at one time back in 1996 when the Olympics were in Atlanta, has to install km signs on the interstate. We had to convert our pipeline installations to metric for permitting. 2" pipe was 50mm. 4" pipe was 100mm and so on. We installed them like 2m off the ROW instead of 6'. So on and so forth. Conversion for us engineers wasn't so hard.
Napoleon had the metric system devised because every country he conquered had a different measurement and scale system. So all Europe and their colonies converted, thus leaving England and all her colonies and ex colonies using the English system. In the meantime, China, India, and Japan converted to metric as well as the Arabic numbering system that we currently use worldwide.
