Exactly, for the last 15 years or I have worked with Hants, Surrey and Sussex Police Forces in their Firing Ranges.
The professionals are trained for either headshot or torso, both of which are immediate knockdown.
I think you will find that in 1817 we had just emerged from the Napoleonic Wars which killed millions across Europe.
Of course the USA is the leading world power, just look at the size of their armed forces (e.g. they have 10 Aircraft Carriers, the Russians have 1) plus the technological...