Which Michael Moore documentary became the highest-grossing documentary at the American box office of all time?
Sicko
Fahrenheit 11/9
Bowling for Columbine
Fahrenheit 9/11
Answer
Fahrenheit 9/11, released in 2004, became the highest-grossing documentary in the American box office, earning $119,194,771. The film critically examines the early presidency of George W. Bush and the War on Terror.