Large enough to ignore a better option. If the US were a small country this would not be a problem.
The same happens with voltages, what side of the road you drive on and the use of imperial for building materials as well as telco standards.
Island nations and very large territories are the ones that exhibit these properties because they can.
What is worse is that as soon as the US invades some territory they push their standards.
The funny thing is that the military usually gets it right because they only care about two things: accuracy and efficiency, there is no consideration for costs to switch or legal hassles, they just choose what works best.
The same happens with voltages, what side of the road you drive on and the use of imperial for building materials as well as telco standards.
Island nations and very large territories are the ones that exhibit these properties because they can.
What is worse is that as soon as the US invades some territory they push their standards.
The funny thing is that the military usually gets it right because they only care about two things: accuracy and efficiency, there is no consideration for costs to switch or legal hassles, they just choose what works best.