I keep a list of historical analogies — derived from years of grading papers — that tell me that the individual using them is (to be polite) more interested in rhetorical impact than historical accuracy. Before last night, the list began with “we need a Marshall Plan for X,” where X usually equals Africa or the Middle East, and ended with “the United States is a young country.” Both are fallacies: the Marshall Plan was a pump-priming program, not an effort to rebuild the infrastructure and remake the culture of half a continent; and while European settlement of North America...