alt Hacker News> heck, only Japan is 110V besides the US as far as I know
Japan is an oddball by being 100V.
US is 120 and that extends pretty far south (and north).
https://en.wikipedia.org/wiki/Mains_electricity_by_country
I’m semi amazed motor vehicles are as standard as they are with 12V and the same socket worldwide. I guess the tobacco industry is a great unifier.
Central/South America has a lot of 100-130 V too, I believe, but I don't have direct personal experience.
I find the standard voltages pretty interesting. The 230 V standard, for example, is mostly a lie. In reality, Britain and former British colonies tend to run on 240 V, and continental Europe/Asia/Africa tends to run on 220 V. The 230 V standard includes wide enough tolerances so that no one needed to actually change anything. I've never actually seen 230 V, the supposed standard, in real life.