In an essay in The New York Review of Books, Jessica Mathews points out that since 1945, Americans of both political parties have accepted three principles. First, that America’s security is enhanced by its broad and deep alliances around the world. Second, that an open global economy is not a zero-sum game but rather allows America to prosper and others to grow. And finally, while there was debate about whether dictatorships were to be “tolerated, managed, or confronted,” in the end there was a faith in democracy and its advantages.