Private land ownership is a big thing here (at least in the Great Lakes region, I'm not sure about other states) and everything is divided into acres instead of hectares. Switching over all at once would be a paperwork clusterfuck just from trying to figure out who owns what. Acres are cut up as 43,560 square feet and there is no way to make a clean break to hectares (roughly 0.4 hectares per acre, but there is decimal loss) without some people losing bits of their property. It's not that big a deal for someone that owns 1 or 2 acres to lose a few inches, but farms and land owners with 100's of acres would have a lot at stake here. This is ignoring the fact that EVERY SINGLE sign on the highway with miles on it would need to be replaced. Who's going to pay for that? People in other countries who complain about the imperial system even though it has little to no impact on their lives? No, the states and cities would be paying for it and I know that most states do not have the money to be thrown around on things like this. Manufacturing, food measurements (packaging, etc.), text books, maps, would all need to eventually be changed and that is not going to be cheap. Let's focus just on one tiny area of industry, forestry. I have a bit of experience in forestry (and a forester roommate) and the equipment here is set up to work in feet. It would cripple most forestry companies to switch equipment to meters. They just don't have the money to buy all new equipment that costs hundreds of thousands of dollars. Lumber mills process based on feet, trees are measured and taken just in feet, and even the most basic of forestry measurements (diameter at breast height) is 4 and a half feet. It doesn't just comes down to a few rednecks that don't like change, it would require a revamping of nearly every area of industry.
Yes, metric is an easier system to follow and use, but it isn't what is established in this country and switching over would take a lot of time and a lot of money. I'm an American in the scientific community who uses both and has no problem with the imperial system or the metric system, but I really have never understood why people from other countries need to complain about the American system. It's such a petty thing, especially on a gaming website where not a single person posting here has the power to change the entire country over to metric. Why complain here? Take it to the President if it chaps your ass so bad.