Why the US Doesn't Use the Metric System

Guest: John Bemelmans Marciano, Author, "Whatever Happened to the Metric System?: How America Kept Its Feet" If you take a drive on Interstate 19 in Southern Arizona you’ll be in for surprise. It is the only stretch of highway in the United States with road signs that show only in kilometers. Turns out Interstate 19 is a leftover from the 70s when the country was preparing to go metric. So, what happened? Today, the United States, Myanmar, and Liberia are the only countries left in the world that don’t use the metric system. Will the United States ever convert to metric?