Thomas Jefferson was a metric nut. Unfortunately the U.S. only adopted metrics for its money. Just think of the lives and money we would have saved if we'd gone metric from the beginning. For a start, that Mars explorer that failed because of software that operated in feet rather than meters (or vice versa) would have succeeded. And Sen. Grassley says we've a similar problem in healthcare sofware.
(At some point in the past I remember we actually had a metric law and the bureaucracy was tasked with the job of getting ready to convert. But the impetus behind it faded. Once again short term gains and convenience trumped long term advantage.)