America has different sized paper

Volts are don't indicate how dangerous something is. You can produce 3,000 volts by rubbing your socks on the carpet.

Not sure of the point you're making. Yes, energy is the issue, so we need to consider source/circuit impedance too, not purely volts. But comparatively speaking the USA's 110 volt supply is proportionately less dangerous with regard to electric shock than our 230 volt one.