What is the most expensive car in United States?

With a base price of $450,000, the Rolls-Royce Phantom is the most expensive car in the United States. It is powered by a 6.75-liter V12 engine that produces 563 horsepower and 664 pound-feet of torque. The Phantom also features a number of luxurious amenities, including a panoramic sunroof, leather seats, and a wood-trimmed cabin.