Which historic merger created the world's largest trade book publisher, bringing together iconic imprints like Knopf, Doubleday, Vintage, and Penguin Classics under one corporate umbrella?

In the ever-evolving world of publishing, mergers and acquisitions have dramatically reshaped the literary landscape. Major publishing houses have consolidated power, creating fewer but larger entities that control significant market share. These strategic moves impact everything from author contracts to book distribution and retail pricing. How well do you know the history of the most significant publishing industry merger in recent decades?

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Penguin Random House (2013)
HarperCollins Hachette (2018)
Simon & Schuster Macmillan (2015)
Bloomsbury Scholastic (2019)