Which hand do you hold a fork in?

In America we use our right hand,pick up the knife cut a piece of meat and with the right hand,put down the knife and use the fork with the right hand,never using the left hand to place food into the mouth.In a movie the American OSS Agent was spotted when he misused the fork as an American,instead of as a European,with the left hand. For the last word on proper etiquette google Emily Post she's the last word on the subject.