Question: Libra is a novel written by an American essayist whose works have covered the advent of what?
Context: Diane Johnson (born April 28, 1934) is an American novelist and essayist whose satirical novels often feature American heroines living abroad in contemporary France.  She was a finalist for the Pulitzer Prize for her novel "Persian Nights" in 1988. Pyotr Alexandrovich Yefremov (Russian: Пётр Александрович Ефремов , born November 17 (O.S., 2), 1830, Moscow, Russian Empire, - died January 8, 1908 [O.S. December 26, 1907], Saint Petersburg, Russian Empire) was a Russian literary historian, publisher, editor and essayist whose works were published regularly by "Sovremennik" (where he debuted in 1857), "Otechestvennye Zapiski", "Russky Arkhiv", "Russkaya Starina", "Istorichesky Vestnik", newspapers "Golos", "Novoye Vremya", "Russkiye Vedomosti".  In 1864-1865 he edited the "Knizhny Vestnik" (The Books Herald) magazine.  Praised as one of the most competent literary scholars of the 19th century, Pyotr Yefremov compiled, edited and published the series of The Works of: Denis Fonvizin (1866), Valerian Maykov (1867), Antiochus Kantemir (1867-1868), Vladimir Lukin (1868), Bogdan Yelchaninov (1868), Alexander Radishchev (1872, Saint Petersburg; banned at the time), Kondraty Ryleyev (1872, 1874), Mikhail Lermontov (1873, 1880, 1887, 1889, also the "Early Dramas" compilation, 1880), Vasily Zhukovsky (1878, 1885), Alexander Pushkin (1880, 1882, 1905, plus two "Yevgeny Onegin" editions, 1874, 1882), Alexander Polezhayev (1889).  He is credited with having discovered, published and written analytical essays on numerous hitherto unknown autographs by classics like Pushkin, Ryleyev, Lermontov, Radishchev, Fonvizin, Zhukovsky. Libra (1988) is a novel written by Don DeLillo.  It focuses on the life of Lee Harvey Oswald and offers a speculative account of the events that shaped the assassination of President John F. Kennedy. Slavenka Drakulić (born July 4, 1949) is a Croatian journalist, novelist, and essayist whose works on feminism, communism, and post-communism have been translated into many languages. Sophie Doin (née Mamy), 1800 – 1846, was a French novelist and essayist whose writings contributed to the renewal of abolitionism in France during the 1820s.  She targeted abuses in the French colonies, most notably Guadeloupe and Martinique, where slavery continued for decades after the declaration of Haitian independence in 1804.  In her various antislavery writings, notably the novel La Famille noire, ou la Traite de l’esclavage [The Black Family, or the Slave Trade], she drew the French public's attention to the injustices committed by the slave system.  She called for a more humane treatment of Blacks, for the abolition of the slave trade, and for religious and practical education that would prepare slaves for eventual emancipation. Norman Pollack (May 29, 1933 – June 11, 2017) was an American historian.  He was an emeritus professor of History at Michigan State University, where he taught for most of his career.  After his retirement, Pollack was a prolific essayist whose writing was informed by his scholarship in the fields of populism and social theory, but were often focused on a structural analysis of capitalism and fascism.  His books included, "The Populist Mind" (1967), "The Populist Response to Industrial America" (1976), "The Just Polity: Populism, Law, and Human Welfare" (1987), and "The Humane Economy: Populism, Capitalism, and Democracy" (1990). Arthur Krystal is an American essayist, editor, and screenwriter.  He has written for The New Yorker, Harper's, The New York Times Book Review, and many other publications.  His books include "The Half-Life of an American Essayist", "Agitations: Essays on Life and Literature", and "Except When I Write: Reflections of a Recovering Critic".  His essay "Except When I Write" appeared in "The Best American Essays 2010". Gabriele Nissim (born 1950) is an Italian journalist, historian and essayist whose works discuss Eastern Europe. Viken Berberian is a writer and essayist whose works rely on satire and defy easy categorization.  Berberian's fiction and essays have been published in the New York Times, Bomb (magazine), le Monde Diplomatique, the International Herald Tribune, the Financial Times, Editions Inculte, (French), the The Believer (magazine), logger, and the Los Angeles Times.  His novels have been translated to French, Hebrew, Italian and Dutch.  They are marked by keen wit and a sense of economic and political injustice. Donald Richard "Don" DeLillo (born November 20, 1936) is an American novelist, playwright and essayist.  His works have covered subjects as diverse as television, nuclear war, sports, the complexities of language, performance art, the Cold War, mathematics, the advent of the digital age, politics, economics, and global terrorism.
Answer: the digital age