I'm pretty sure Congress had set a date for several years ago for the US to officially switch to the metric system but that killed as it got closer. The problem is that darn near every piece of manufacturing equipment in the US uses inches and feet. Every road sign is in miles. It's an expensive switch to make but it would be nice to see us start using both to make the transition. We have some manufacturing overseas and a lot of international customers so we have supported both measurement systems in our manufacturing environment for years. Our component drawings show both measurement systems on every dimension.