The rates of obesity and general ill-health are far greater in the USA than anywhere in Europe.
Americans mentally have never had hardship in war since probably the American Civil War, and even then it was sporadic.
Most weaponry does not require a 18 stone wall of muscle to use. AKs can even be used by children effectively. I think one of the German Emperors was the last person to try to get giants to fight as a unit (the father of Peter the Great). They were useless and slaughtered by cannon and shot. Things have advanced since then.
Although as I say above, the wide neck is more usually going to be encircling a vast amount of fat.
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