There are 240v outlets in the USA, but they’re usually only used for things with heavy power draw (clothes dryers, EV chargers, electric hot water heaters, etc). Some areas have 208v instead of 240v though.
But yeah, boiling water is slow in the USA and a lot of people do it in the microwave (whereas I never saw anyone ever do that in Australia). We’ve got a Breville espresso machine that has instant hot water, which is useful for some of the use cases we’d use a kettle for.