FILE - In this Aug. 12, 2017 file photo, Robert Caro attends the East Hampton Library's 13th Annual Authors Night Benefit in East Hampton, N.Y.  Caro offered his observations on the 1960s in a speech Saturday, April 15, 2018,  at the New-York Historical Society, weaving events in Lyndon Johnson's presidency with a pair of songs he said demonstrated the decade's disillusionment and hopes for change. (Photo by Scott Roth/Invision/AP, File)