David Frum is a Washington-based political advisor and an editor of the Atlantic Magazine. He is also the former Special Advisor and speech writer to President George W Bush, and was working at the White House when America was attacked by terrorists on September 11th 2001. In this essay, recorded with BBC Partners the British Council at the United States Library of Congress, he explains how World War One came to shape US Foreign Policy through the twentieth century and still has a strong effect on how American engages with the world today.