Implement metrication: it's been nearly 150 years since the metric system was adopted.

In 1866 the U.S. adopted the metric system; you wouldn’t know that by looking at things today. Our weather forecasts are in Fahrenheit and inches instead of Celsius, centimeters, and millimeters. Our roads and speeds are marked in miles instead of kilometers, gasoline is dispensed in gallons instead of liters, and while packing on goods may be marked in U.S. standard and metric, the metric measurements are given less prominence and quantities are optimised for the U.S. measurement system. To be on par with the rest of the world (excepting Burma and Liberia), prevent disasters due to measurement system confusion, and improve math and science proficiency, the U.S. needs to institute a hard metric transition.
Non-metric usage won't die (e.g. Canada and the UK), but metrication is imperative