Margaret MacMillan

[Margaret MacMillan](http://margaretmacmillan.com/) is a former Warden of St Antony’s College, Oxford University and a professor of History at the University of Toronto. She is the author of several books on international history including _Paris 1919: Six Months that Changed the World_; _Nixon and Mao: the Week that Changed the World_; and _The War that Ended Peace: the Road to 1914._

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US-Mexico border
19th Century

Why the U.S. Has Spent 200 Years Flip-Flopping Between Isolationism and Engagement

What does the United States want to be to the world?