Negative ground simplifies alternator and radio stocking. Solid state regulators, rectifiers, and radios absolutely can't tolerate reversed voltage for even a microsecond. "Lets the smoke out." Burns things to a crisp inside the solid state devices, sometimes outside.
Before the negative ground situation became SOP, radios often came with polarity switching plugs, whether for broadcast or two way.
Certainly using both polarities on different equipment added complication and yet 30 or 40 years (as of 1955) of experience hadn't shown any benefit of positive or negative ground over the other polarity. But to the less experienced person troubleshooting, positive ground causes much confusion, even today. And can get you into deep trouble when jump starting.
In my reading of SAE handbooks, I didn't detect a government requirement, just the results of an SAE study committee. Though in looking on line for J543a, I have come upon government standards relying on it and requiring negative ground.
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