@ The Cube...
If it wasn't for the Americans in WWII, you would be sprechen sie Deutsche and saying "Sieg Heil".
That said, it isn't just the US who prefers to maintain their own standards compared to the EU, and therefore assure that the "One World Order" doesn't happen. The UK also maintains many standards of their own that also differ from the EU. Better? Worse? It doesn't matter. It's what we're used to in the way of measurements, no matter which side of the Atlantic you're from. A good chunk of US standards originated from England, such as the inch, mile, acre, etc. And, neither of us are spending Euros either... We have stuck with the Dollar, and the UK prefers those Pounds Sterling.
As for the plug standard, I would prefer a 3-phase solution in the long run, as this would mean that smaller wires would be needed, and a loss reduction would be realized. Short term, however, as was noted earlier, a 220V standard would be needed, as this is what feeds the residential districts. However, if the infrastructure was revamped for the addition of a 3-phase outlet for the garage (Business districts already have 3-phase wiring available) then the long term goal of a 3-phase solution would be practical (440V in this case). But, until then, a 220V solution would mean quicker adoption, as this can be used with the existing infrastructure in the US. Then, as 3-phase becomes accessible to the residences, the 440V solution could be more readily adopted.