Da "Boxing" di Edwin L.Haislet, 1940.
EXPLANATION (of the boxing stance, ndr)
A square stance was used during the Grecian period, that is, the left arm was folded high and close to the body and use primarily for defensive purposes while the right arm was used in a hooking, swinging movement.
In England the boxing position seems to have developed from the fencing position, with the right foot and hand carried forward, with the left side of the body back (cit. Norman Clarke, How to Box. New York: Dornan and Company, 1925). As the desire developed to hit with both hands, the square and then gradually the present so-called orthodox stance evolved. Clarke suggests the reason to be that the left hand was found to be faster than the right hand from the square stance.
There is little doubt that the present orthodox position resulted because of right-handed hitting. For any movement of the right hand in which power is needed, it is only natural in att throwing events, and it is the position of the blacksmith when swinging a sledge. Because most people are right-handed, it is necessary to shift the left foot forward in order to obtain power in right-handed blows.