Are right-hand drive cars illegal in the States?
do you mean the cars that have the steering wheel on the right side of the vehicle? I don't think so, I've seen a few of them herein the States.
yes but is that law enforced
I certainly hope not because I've seen numerous Rolls, Bentley's & some older Mercedes as well with the wheel on the right / wrong side
They are legal to drive in USA but you will need to be very carful on two lane roads when overtaking.
No, just not that many. Drive Carefully! In Nevada a computer can drive a car, some others, too. California is thinking it over, by the way.
I've got one for sale on my used lot right now, a Jeep Wrangler. My manager says it was used as for mail delivery.