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You mean 110V countries don't just run at double the amps?

Nope, because then you need bigger wires, and copper ain't cheap. Whereas on the same wires if the voltage is bumped, you get a wattage bump, too. So Europe gets kettles that heat twice as quickly as U. S. kettles.

In the US, the typical circuit max is 15 A. Some outlets provide more (e.g. 20 A for an electric clothes dryer, though those usually run on 240 V).

https://en.wikipedia.org/wiki/NEMA_connector#/media/File:NEM...

120V circuits are typically 15A. My kettle is 1500W.