My parents are not from the USA and don’t have USA bank accounts or credit cards and have had no problems renting a car in Europe or anywhere else they went. I really don’t get what you mean. I don’t see why you specifically need an American card and not just a credit card from any modern country.
Car rentals almost exclusively accept payment by credit card, unless you have a corporate account that is billed periodically.
I’m sure you can find an exception but please let’s not fly off to nitpick land.
My parents are not from the USA and don’t have USA bank accounts or credit cards and have had no problems renting a car in Europe or anywhere else they went. I really don’t get what you mean. I don’t see why you specifically need an American card and not just a credit card from any modern country.