Database: cars
Question: What is the name of the most expensive car that was produced by the USA?
SQL: SELECT T4.car_name FROM price AS T1 INNER JOIN production AS T2 ON T1.ID = T2.ID INNER JOIN country AS T3 ON T3.origin = T2.country INNER JOIN data AS T4 ON T4.ID = T1.ID WHERE T3.country = 'USA' ORDER BY T1.price DESC LIMIT 1