Units of measurement from the U.S.A. Vs. The Metric System of Europe

How did this come to be? Why so many different ways to measure the weight of something or the distance to somewhere? Let's take a look and, may want to read about the History of the Entire process of Units of measurement. It's fascinating! I used to travel around the world and if I had know then both Imperical Measurements and The Metric System, I would have been much better off. There's a formula for calculating temperature from Fahrenheit to Celsius.