Theodore Roosevelt's policy to build a two-ocean navy confirmed that the old-style isolationism of the founders had not survived the modern, increasingly globalized world.
A lot of my father's family in Canada volunteered in the First World War because they saw it as a war that was defending the mother country.
Managing the relationship with a giant neighbour has been central to our foreign policy for more than a century. Trade and investment, as well as people, have flowed back and forth across the border, and the U.S. is, by far, our biggest trading partner.
Exercising power can do strange things to people. You can become convinced that you're irreplaceable. You can become convinced that you're always right. And I think the danger is the longer you stay in power, the more likely that is to happen.
Nominally left- and right-wing populists differ primarily in their choice of which 'others' to exclude and attack, with the former singling out big corporations and oligarchs, and the latter targeting ethnic or religious minorities.
History belongs to everyone. I don't think you have to give up scholarly standards. But I also don't think you want to write something that is impenetrable. You try as hard as you can to be readable.
