When we set out to investigate the past, like archaeologists we dig up and examine all sorts of information. We might begin with history texts, like Wilfred McClay’s “Land of Hope: An Invitation to the Great American Story,” which provide us with a barebones but broad account of people and events from another era. We then zero in on a particular incident, reading a book like David McCullough’s “The Johnstown Flood” if we wish further enlightenment.
Stirred by such an account, energetic truth seekers may then navigate from these secondary sources to primary ones. To explore the Johnstown flood, for example, they may look for newspaper articles or letters from eyewitnesses of that disaster.