Why does tipping seem to be mandatory in America?

I live in the UK and while you should tip here it's not mandatory. It's a choice plus what if you only have enough for the bill or if you had crap service. My boyfriend and I go to cafes and don't tip and we still get good service (although we're only buying a drink not a meal). Why is it different... show more I live in the UK and while you should tip here it's not mandatory. It's a choice plus what if you only have enough for the bill or if you had crap service. My boyfriend and I go to cafes and don't tip and we still get good service (although we're only buying a drink not a meal). Why is it different in America? Why not just make it mandatory to pay wait staff a decent wage?
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