The US drives on the right (which is the right) side. So why would the US switch? Its really just Australia, Japan, India and the UK that drive on the left. The other 190ish countries all drive on the right.

PS Your 240V electric grid works that way because when the US switched to 120V (in like 1900 or so), we sold all our old gear to you and you never switched. So now all your electric things cost more as a result and your electrical outlets will kill you. So your decision making on such things is suspect.

The US has a 240 volt electric system nearly everywhere. The exceptions are some industrial factories that get higher voltage. There might be a handful of houses that haven't upgraded their electric system since the 1950s that are still 120volt only, but that is very rare (I've heard of it, but never seen it). We use 120 volts to outlets (120 is half of 240), but the system itself is 240 volts.

Would you care to cite the statistics you have showing higher per-capita accidental electric shock deaths? I'm struggling to find any.

Electric distributon costs less because less copper/aluminum. 120V exists because the US is plagued by lawyers.