Philip Toll Hill , Jr. ( April 20 , 1927 -- August 28 , 2008 ) was an American automobile racer and the only American-born driver to win the Formula One World Drivers ' Championship ( Mario Andretti , an American driver , won the World Drivers ' Championship in 1978 , but was not born in the United States ) .
Philip Toll Hill , Jr. , ( April 20 , 1927 -- August 28 , 2008 ) was an American automobile racer and the only American-born driver to win the Formula One World Drivers ' Championship .