Metric System Vs. Imperial System
One of the age-old arguments a majority of the world has with the United States is why the country insists on staying with the imperial system of measurement. Aside from Liberia and Myanmar, the rest of the world, as you can see by the gray masses, use the metric system.
In America’s defense, they can actually blame the British on the unit of measurement. Hundreds of years ago, when the British colonized America, they brought with them the imperial system. Ever since, Americans have used that system, deciding not to jump on the metric system-train, so to speak.