The US systems are 120 V line-to-neutral (ground), whereas the European and lots of other countries are 230 V line-to-neutral. So after going through a distribu

The US systems are 120 V line-to-neutral (ground), whereas the European and lots of other countries are 230 V line-to-neutral. So after going through a distribution transformer, the non-US systems are at a higher voltage, which means you can distribute the power further without large losses. This leads to more neighborhood-level transformers serving dozens of consumers instead of the US practice of using split-phase transformers to serve only 2 consumers at a time.