I asked the question many years ago in an electrical engineering course in college. A couple explanations:
1 - Positive grounding was simply the early engineers' arbitrary choice.
2 - Oxygen molecules (the key element involved metallic corrosion) tend to be more attracted to the negative side of any circuit. By making systems positive ground (ie wiring is negatively charged relative to ground), wiring and connections tend to be less affected by corrosion.
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My experience after 40+ years of fooling with both + and - grounded systems has me leaning toward #1. I suspect the designers had to agree on a "standard" ground polarity. Someone tossed a coin and positive ground was the winner. (Then I'll bet they all adjourned to drink beer by a fire on a cold winter day - just like I'm doing now...)
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